if you can pee you can paint ehh?
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With the doors either get a mohair mini roller (make sure you wash it well before first use), or a mini foam roller. Roll the doors and then lay off with a decent brush. Much quicker and a more even finish.
Are you using oil based or water based paint on the woodwork? if it's water based you'll need to work fairly quick and not go back over your work too much, if it's oil the new post 2010 paints take a month to go off so you'll have plenty of time. A pro would have a 6 panelled doors coated on both sides in around 10 mins, if they are flat doors even less:smilewinkgrin: