if your laquer is orange peeling, its becaue you are moving too quickly with the can, its a bit of an art form ,but with a bit of practice you can get quite good at it. go too slow and you'll get runs.
i tend to start at the top and work across in lines, nice and steady. do the edges last, but becareful with them, because by then you'll be adding to the laquer on the top and you'll most likly get runs.
you should be able to see the surface change as you do it. you'll see it orange peel if you go to slow, just go back over it, if its already set, you might be able to use a levelling spray. it reactivates the laquer and helps it level out, but i don't know what the time limit is for using it on set laquer.