Hi Max.
Welcome here! I'm fairly new myself. Lot's of great information on BP.
I haven't taken a 203k myself, but I've been doing a lot of research on this loan option recently.
With an FHA 203K you must have a licensed contractor complete all of the renovations. Even if you are a licensed contractor yourself, FHA requires a 3rd party. The contractor should also be familiar with the paperwork involved with an FHA/rehab loan and have the funds available to complete the project (since they won't be released the funds up front). I've heard of folks working with their contractors and using sweat equity to help with the renovations, and FHA should be OK with that, as long as the contractor oversees and takes responsibility over the project.
If you want to do some work yourself, are capable of putting down a larger down payment (15% - 20%), and this is a one-unit property, consider the FannieMae HomeStyle Loan.
https://www.fanniemae.com/content/guide/selling/b5...
"Under Fannie Mae’s “Do It Yourself” repair option, which is available for one-unit properties only, the borrower may complete repairs that the lender reviews and approves in advance. Do It Yourself repairs may not represent more than 10% of the “as completed” value of the property; the lender must inspect the completion of all repair items that cost more than $5,000."
In any case, I stumbled upon a really cool post today by Ryan Murphy, which provides pros and cons for both the FHA 203K and FannieMae HomeStyle Loan options. Take a look at this thread:
https://www.biggerpockets.com/forums/311/topics/14...
Also, give a search on BP for "203K" and you'll a ton of posts with folks' experiences.
Good luck!
Ed