Now time to get the new belts on. First we put the alt belt on. Look at the drawing you made (you did make that drawing didn't you?) and put the belt on all the pulleys except for the tensioner pulley so that it appears as in the picture below.

Once that is done put the belt around the hex bit so that you will be able to slip the belt on when the tensioner is detensioned. Now pull up on the socket wrench to detension the tensioner and slip the belt onto the tensioner pulley.

Let off the tension slowly. Once that is done check how the belt it situated on each of the pulleys to make sure it is on right, more than likely one of them won't be quite right so detension it a bit again and fix the belt.

Once the belt is situated on all the pulleys it should look as it did before you started