2manyrocks,
sorry for the delay, been to busy to reply.What a lot of good info since I'm been away.
mark777 sounds like he is very knowledgeable with a lot of good ideas.I was suggesting the
glass guns only because I thought you were on a tight budget with no equipment.But the bottom line is probably borrowing or buying the right things to do the job.Assuming your going to do that, I will second mark777 on the gravity hvlp guns,I buy my primer guns from HF and they spray good enough.I would strongly reccomend going with a clearcoat no matter what brand you use.And again"you get what you pay for"
As mark said, pressure washing is good but if you can get a steam cleaner that would be better.It can never be too clean!!IMO I use a red scotch brite pad with dishwashing soap to "sand" the tight areas before your ready to paint.
One thing I haven't seen mentioned, I would use a non-sanding self etching primer/sealer as your 1st coat to promote adhesion to the old surface.
$300 sounds a little high but with 3 colors it may be.