I went to my friend's house to survey his place. I brought over one of my low-flow facuet heads because I'm not sure that it is the right size for my sink. I said he could use it for now, but that I may want it back when my dad comes to visit because my dad will be able to help me take out the old faucet head and install the new ones, so he'll be able to tell me if it will fit or not!
I also brought some compact flourescent light bulbs that I had left over, so that he could change out his.
I gave a few more suggestions, but figured, baby steps...!