Youtube has a ton of bike maintenance videos too.

I just upgraded my Trek 1200 from tiagra/105/bontrager select components to nearly all ultegra 6600 pieces. Only needed to buy the Octalink 2 BB wrench and a crank remover. To get the old ISIS BB out I just paid a shop $5 for the 5 minutes it took them to remove it. Couldn't see the point in buying the ISIS tool when I only needed it once. I also paid another $5 to have the shop torque a few of the bolts and the BB for me.

I only have 1 bike so the BB swaps should be few and far between.