I went through HPAP, too; It's a great program. It's crucial to find an agent who is experienced in how the program works, you also have to do some legwork. Make a list of your "must-haves" (neighborhood, number of bed/bathrooms, carpet or hardwood, etc) and check out trulia or franklymls to see what kinds of properties you can realistically expect to find in your price range. Knowing exactly what you want and where you'd like to live will make it easier for your agent to target their search.
As far as the HPAP inspection, it is stringent; make sure you hire a thorough inspector who understands HPAP requirements for your buyer's inspection. My inspector failed my condo 4 times because he knew what HPAP looks for, so my unit was able to easily pass the HPAP inspection. Again, an agent with HPAP experience will know what types of things to look for and can tell you when you're viewing a property whether or not it is likely to pass HPAP.