I used a generic autozone puller to get my pulley separated from the shaft. A well-placed blow to the pulley while under some tension is usually enough to get it apart.

The reseal process itself is not too difficult. There's not too many parts involved and if you take your time, you'll have no problems.

I believe the puller is the only special tool required. I had a step-by-step 'how-to' article around here somewhere -- I'll post it if and when it's found.