Piano

[BardoXV]

I have a question for anyone who might have some ideas for me to try. In HS I took piano lessons and had learned to play several pieces, mostly classical but also some more modern works. I got away from the piano and didn't have an instrument to use for about 42 years, and now I have had a piano for the last 3 years. My problem is that there are several pieces that I played before, and now I haven't been able to just pick them up again, and I get frustrated trying. Does anyone have any suggestions on how I can more easily learn to play pieced that I had played before. It seems that new pieces are easier to learn, but that might be that I don't have any expectations of being able to play them at all, and the ones that I had played before, frustrate me when I can't just pick them up again.

P.S. If someone plays a different instrument, that's OK I just need to know what technique works for you, and I'll try it.