Such a large topic not enough space to cover (pun?).

Few things.
Equipment- most would be pleased to know the budget priced spraygun offered by HF are made in the same factory as the better name known as with initials 'D..bz' (will not disclose so as not to to get into legal trouble). HVLP or not, the key is finding one that will spray consistent and well atomized. HVLP is ideal because it atomizes the material well and gets it to the surface rather than clouding the air. As mentioned above, you need a BIG compressor but most important, one with high volume. Also, use an air hose with large id. You want the volume. I'm lucky enough to have three booths at hand and massive factory compressors to tap into.

Filtering could be another entire thread subject, but its critical to have filtering.

Let that chemistry work. The products available today are amazing. Though you've got to do your homework and follow those manufacturers directions. Personally, I find the two part urethane outstanding. I can spray something and actually handle short of 15 minutes! Of course its not fully cured but gives one the idea how remarkable this poison is.

I've sprayed in extreme wet dripping hot humidity but used lots of drier additive. Hated the timing of it but did just that for a fellow forum member. Couldn't believe but it turned out well. He procrastinated on getting the frame prepped and left it with me during a brutal week in August. Had to be ready to ride the following weekend. We started assembly the evening after spraying the clear. Yep.

Recently returned from the CR weekend. Had a few very interesting conversations with the best and much respected JP Weigle, J. Bell and J. Cunningham. Peter JUST a week prior to the weekend, sprayed his as usual stunning show bike and here he was riding it in the rain! Both he and Bell like Imron.

Anyways, theres many ways to paint from simple to major complicated and challenging. Suggest to explore and give it a try.