But, the only way to gain experience is to keep advancing one step at a time...
You learn as you go along, and this was another attempt for the OP to advance his skills, but Dave didn't want to help him and tell him how to get the parts he sold him to fit...
If you don't take a chance to advance and buy parts for that next step, you won't get to the next level... Learn as you go and don't be afraid to try new things...