The 203K loan is great! I just got one for my current flip. Here was my process:
Find a few properties and look at them with realtor.
Make an offer contingent on inspection - offer countered and accepted
Order inspection
Get bids from trades based on what inspection said is wrong
Counteroffer based on undisclosed issues and what the bids came in at (electrical was not completely updated and up to code)
Seller countered a little higher and I agreed
I then went to bank (I had also talked with them before starting the process to make sure I qualified) with my purchase agreement and the bids from the trades (electrical update, new furnace and AC) I also gave them a list of the improvements that I was going to do to the property
They got an appraisal based on value after my improvements
Got 100% loan for purchase and $25,000 in rehab money. I didn't have to pay a dime out of pocket because my $52,500 purchase should market for $150,000 when I'm done. More than I had even estimated.
This was my process on this purchase. This is not the norm for most people. I got a steal because the husband had passed away in the middle of the renovation and only someone that was willing to finish the rehab would buy it. Some of the work he had completed was great (custom cabinets) and some was pretty sketchy (tile in bathroom glued to plywood floor, half-assed electrical update and unmarked box). Hubby and I do all but the HVAC and electrical work ourselves.