Chord charts and fake books were a help to me whenI was playing on a regular basis. I had a large notebook(loose leaf) and I would put it on the piano(the sheets filed alphabetically) and if I needed to, I would flip to the song in question. Just the fact of having it there helped me to remember to some extent simply because I knew it was there. When necessary, I would look at the chords and would be able to play most songs as they would refresh my memory. If necessary, I would just read the chords. Using numbers, you can transpose, or use the transpose switch. Happy playing.
