(hint: it didn't even require a tool) There are times though when it makes a lot of sense to let the professionals do their thing - I will install fans , electrical outlets , toilets, garbage disposals, shower heads and other menial tasks  - but when it comes to outdoor ( high voltage) electricity , large trees, A/C work, and things of that nature  - I let the pros do the work.    

That isn't on the National Code Book but on the the NFPA 72 (Which stands for National Fire Alarm and Signaling code) has a requirement that smokes have to be installed inside each bedroom (they say sleep rooms in case people transform other rooms into bedrooms) even for existing homes in addition to requiring them outside each sleeping area and then one on each level of the home that is a combo carbon/smoke (Additional smoke alarms are required for larger homes.)

. § 14-11-702, which reads as follws: (b) Without excluding other activities which may not constitute transacting business in this state, a foreign limited liability company shall not be considered to be transacting business in this state, for the purpose of qualification under this chapter, solely by reason of carrying on in this state any one or more of the following activities: (1) Maintaining or defending any action or administrative or arbitration proceeding or effecting the settlement thereof or the settlement of claims or disputes; (2) Holding meetings of its managers, members, or other owners or carrying on other activities concerning its internal affairs; (3) Maintaining bank accounts, share accounts in savings and loan associations, custodial or agency arrangements with a bank or trust company, or stock or bond brokerage accounts; (4) Maintaining offices or agencies for the transfer, exchange, and registration of membership or other ownership interests in it or appointing and maintaining trustees or depositaries with relation to such interests; (5) Effecting sales through independent contractors; (6) Soliciting or procuring orders, whether by mail or through employees or agents or otherwise, where such orders require acceptance outside this state before becoming binding contracts and where such contracts do not involve any local performance other than delivery and installation; (7) Making loans or creating or acquiring evidences of debt, mortgages, or liens on real or personal property or recording the same; (8) Securing or collecting debts or enforcing any rights in property securing the same; (9) Owning, without more, real or personal property; (10) Conducting an isolated transaction not in the course of a number of repeated transactions of a like nature; (11) Effecting transactions in interstate or foreign commerce; (12) Serving as trustee, executor, administrator, or guardian, or in like fiduciary capacity, where permitted so to serve by the laws of this state; or (13) Owning directly or indirectly an interest in or controlling directly or indirectly another person organized under the laws of or transacting business within this state.Good luck!

That's where a lot installers buy flooring from.

@Victor S.I’ve painted before & installed countertops so at least I won’t spend much doing that.

The central air unit/coil was newly installed a few months before I bought the place so I'm not expecting/planning any capital expenditures on the unit. 

@Monica Chan if the 2 unit is in a nicer area you might just install laundry machines, not coin operated ones.

I suggested installing lally columns and smaller floor joyces. 

(a) No landlord shall rent or cause to be rented any unit in which the tenant is responsible by agreement, implication, or otherwise for direct payment for utility service to the utility company and in which the utility company billing for that service includes any service to common areas of the building or other units or areas used or occupied by persons other than the individual tenant and those occupying the unit with the tenant on the utility account, unless, before offering an initial lease or a renewal lease, accepting a security deposit, or otherwise entering into an agreement with the prospective tenant to let the premises: (1) The landlord provides the prospective tenant with a written statement setting forth the specific areas of the building and any appurtenances that are served by the meter that will be in the tenant's name and the nature of the utility uses of those areas, including any that have not been reflected in past utility company billings but that may arise (such as the rental of a neighboring unit that has been vacant, the installation of washers and driers in the basement, or the use of the garage for mechanics); (2) The landlord provides the prospective tenant with copies of the utility bills for the unit for the previous 12 months, unless waived by the tenant in writing; (3) The landlord neither suggests nor requires the tenant to collect any money for utility bills from neighboring tenants whose utility usage will be reflected in the prospective tenant's utility company billings; and (4) The landlord sets forth in writing the amount of the proposed rent reduction, if any, that is offered to compensate for the tenant's payments for utility usage outside of the tenant's unit.

How do you store all the installation materials that come with everything you buy for your properties?