My big hurdle, and to some extent it still is one, is having people you can call to patch/repair/replace when you can't or don't want to do it yourself.

We decided that in cookie cutter neighborhoods, appraisers just don't give you enough credit for your upgrades so it's better to patch and paint and sell for a cheap price and turn your money faster instead of trying to shoot for the moon. 

Also do you have any extra lease provisions, my thoughts are no hanging things from walls to avoid having to patch nail holes but don't know if that is going too far. 

Again patching them is not a highly skilled task , however achieving a smooth finish needs skill , but a reasonable handy person can learn fairly easily .

Well, since I did not fall off the turnip patch I asked if the mobile home was registered as a vehicle or was it attached to the lot, since there was no paperwork for it. 

We live in the same cabbage patch and our patch has a lot of asbestos.in it.

If the switch is white you can just spray paint them.It depends on what kind of rental you have with what they expect.We have small old water stains from previous leaks on the ceiling when tenant moves out.I buy a spray can of Kilz for 5 bucks and usually last about for 2 of my apartment units hitting spots.You can't tell afterwords with the ceiling and it looks great.It's cheaper than scraping popcorn and trying to match or scraping the whole ceiling and a flat ceiling because it is old showing all imperfections if you just scrape and paint it.On the light switches I agree it works to replace them all but in older apartment buildings I try not to do that because what I have found is the wiring in behind is cut short or has too much excess crammed in.So if the wiring was all clean and the right slack from out of the box it would be easy to replace.I have found that some go smoothly and the others are a bit of a pain to change out making adjustments.The Kilz for the ceiling I only do that on non-active leaks where the drywall still has integrity to it and is not sagging.If it is sagging I cut out and put a patch in and then popcorn over it after priming to stick.All my tenants want is a nice,clean place to live.If you have a high end tenants paying premium bucks then finish level and what the tenant expects will change.In mine replacing everything will only net me maybe another 30 bucks a month in rent and the thousands spent will take 5 to 8 years to recover if everything goes perfectly with each unit.

Our EPA agency has went nuts over it recently with certain procedures and licensing and heavy fines If you do not comply.Carpet and paint and wall patch is cheap and easy as is lights and fixtures.

The nails come out easily with little patch work and often times the glue will sand down.

You have to have the reserves to get over any rough patch or you can lose everything.