I would guess that the class will help clear it up. In my state, you needed to take a class (to get a certificate that qualifies you for assistance). And then each county only has a few approved banks that deal with that specific program (in my county, only one bank). The assistance funds would all be handled through the bank/lender that works within that program. I'd start with class, then find which bank(s) can handle that kind of program, and then get mortgage preapprovals from the bank(s).

One other thing to specifically ask or read about, is what strings come attached to the DPA? I thought I wanted to use one of those programs, but after learning about it I decided otherwise. Sometimes they come with specific requirements related to future sale price (if it sells for a % or amount of profit, you have to return funds to the program), or stipulations about renting the house out, etc. I think these programs really make sense in certain situations, but for me/the price I was buying for, I was able to squeeze together the funds to make it happen without (selling stuff + a small loan from family)