Nah you don't need a spray gun man... Make sure you don't sand it too early. I would wait AT LEAST 24 hours, but like troy said, no more than 3 days (Begins to harden too much).
Also again, agree with what Troy said, you need to sand it back enough to get rid of those bumpy orange peel parts (The parts which are a tad higher than the rest of the clear).
That said though - You don't want to sand PAST that flat bit, because all sanding after that, is sanding into good clear.
Make sure you use a good buffer as well. You can't really hand polish that hazy look out well, you do need a good quality buffer and also, just as importantly, a good buffing pad.
Edit: I've done great clears with the good quality can stuff. I have a air gun as well, but wouldn't use it unless its something good sized (IE: Bumper +). There are good quality cans these days are pretty awesome.