Well bravo to you. Everyone needs a nice neighbor that's wanting and willing to help out. He's lucky.
Lemme know if you have any questions about Slamming his pool. Biggest thing with it is the more you keep FC up to shock level (but no more often than say 30 mins) the quicker the slam will be. As more time passes during the slam, you'll notice the FC falling slower and slower and you won't need to add bleach quite as much. Also, if you get the liquid shock from Walmart's pool isle, you won't need to add as much volume wise since it's 10% chlorine, vs regular bleach's typically 6% chlorine.