In what respect bud?
I'm not a professional sprayer by any means, but I've done odd bits over the years for myself. This is the biggest project I've ever taken on, but it's satisfying when it goes right - and nice to be able to say I did it myself!
The best advice I could give, is to buy the best and biggest air compressor you can. I have a 3hp 100l compressor at home, which struggles to supply enough air for painting. My 150l belt driven industrial compressor will run a spray gun all day long, which cost circa £600.
A cheap gun is fine for primer and base coat, but you do want a good gun for clear. The difference in control is staggering. My clear gun is a devilbiss flg-5, which is budget high end, although I'd really like a gti pro, but can't justify the outlay when I don't do it very often
A good da sander is crucial, as it cuts prep time down massively. Also good quality buffing pads on a rotary is essential - a da polisher will do the job, but you'll be there for months!
I try to maintain around 20c when spraying, I have a diesel space heater to warm the workshop up prior if necessary.
All paints mix slightly differently, so always best to follow the manufacturers recommendations. If using 2k primer, leave it a week before flatting, as it can shrink, and it'll show in the paint later.
Like anything, you get better with practice. Always best to do some spray outs on scrap panels, to get a feel of what you're doing. Wet sanding and buffing is hard work, and takes a lot of practice. It's very easy to ruin paint if you're not careful. Again, experience tells you when you're doing it right - and you should expect to ruin the first few bits you try!
A good quality organic vapour mask is essential. Isocyanates are linked to all kinds of respiratory problems, and can kill. If you can smell the paint through your mask, it's not good enough!