I have sprayed full panels previously with aerosols with good results, both solid colours and metallics. As said preparation is the key - what looks / feels smooth, is still likely to show minor imperfections when the colour goes on, with the paint sinking between the original and the new, or at the edge of any filler. Primer filler can be flatted back to remove any slight imperfections before applying the colour.
Allowing sufficient time between coats for the solvent to evaporate is important, otherwise 'trapped' solvent will result in disastrous results when it dries.
When you are satisfied with your primer coat, just apply a very very light dust coat of colour (any colour but the same type of paint(!), but darker the better) and let it dry (should be quite quickly). This will highlight any imperfections, and at this point they will be easy to rectify with wet / dry or if particularly noticeable with some stopper. Re apply a coat of primer if stopper is used, and let it dry, and then re apply a dust coat. When the surface looks good, the apply the colour, remembering that with metallics, it is just that, a colour, with the laquer giving the depth of shine.
You need to apply the paint in thin coats first, allowing 10 mins between coats for the solvent to evaporate and then a wet coat so that it runs into itself, which initially looks wet, but applying too much will cause runs, especially where the aerosol movement momentarily pauses.... The final coat should be a relative thin coat, but sufficient for it to look slightly wet. If the paint requires a laquer, it should be applied after your final colour coat has started to go off, probably 15 mins, and apply in light coats remembering that when it is polished, you are removing a thin layer. If you cut through the laquer when polishing, it has be reapplied, and sometimes you have to go back to the colour stage.
Removal of as much trim as you can is beneficial, as masking leaves a raw edge which can flake or lift over time. Soft edge foam masking tape is better, as the edge of paint is gradual / feathered and is easier to cut back and loose.
Sounds difficult but practise makes perfect as they say.
It is too hot to spray aerosols really at the moment, as the paint will start to dry as soon as leaves the nozzle, and can result in a 'gritty' finish. Equally, damp in the air on a cold or wet day, will not result in a good finish, and in the worst cases can cause blooming of the finish.
But good finishes can be achieved with aerosols, but it can't be rushed. If you get a foreign body in your refreshly applied paint, don't be tempted to try and remove it immediately - it can be dealt with when it has gone off, but it's annoying if the small midge doesn't give up and creates small circles in the paint before it finally gives up!
Good luck!