I'm writing an offer on a property that I'm planning to pay all cash for. 

We're planning on doing a 1031/121 combo.

For example, I've seen where a hobbyist investor/developer works on project, they hire an engineer and/or architect, but they ended up missing something vital, i.e. drainage issues, environmental, fire dept review, planning the wrong type of product for that market (buyer & renter demographic), etc.

We plan to keep the property forever.

I work with a retired man would can draw plans for houses and used to build houses. 

What is your plan for using your license?

If you don't have experience, you'll have a hard time getting financing on something like this as your first property because lenders will want you to have experience, especially if you don't plan to hire professional management.

I plan to live on the property and eventually sell (it's vacant with no squatters).

Echoing what Nathan said-make sure you compare the scope of work both are planning on doing and vet your person.

I plan on stating in the lease absolutely no space heaters as they draw a ton of amperage.