spend most of the time on the preperation mate, a good surface and plastic primer will make sure the paint doesnt start flaking off
sand with a fine grit paper 2500 if you can, use it in between coats, until you get to the last layer of paint dont sand it, laquering leave a good week for it to harden fully, apply a good 4 -5 coats of it too
like said its going to be best with a spray gun instead of a can, if you have a compressor then you can use that, but still wont be as good as taking to a bodyshop as they have booths to stop the dust settling on the paint etc
take your time with it, mask it up properly and prep it good and proper and you cant go wrong