Removing the rear cogs requires a special tool (or 2).
Replacing a spoke is pretty easy.
Truing a wheel takes a little practice but is not too difficult. I have done this by the roadside several times. You have to balance trueness of the rim with spoke tension (adjusted with a spoke key such as Spokey). You dont need a rig, you can use the brake blocks to guage trueness.
If you need the bike back in action quickly, get it done at a bike shop. In the meantime look for an old front wheel that you can practice on.