annoying, but not major.
When doing the idle reset, the car at normal running temp (hot) should rev up to about 1700rpm, and drop slowly to just above stall, pick back up and normalise. The ECU will read if idle learning has been completed.
You can clean the MAF, its good practice. Use an electrical contact cleaner, or auto shop MAF cleaner. Other general cleaners may be too harsh esp carb cleaner. Make sure you have no vacuum leaks- all hoses plugged back in, the oil filler rubber isn't folded into the plenum (guilty of that ), and you have evenly tightened down the plenum. Its really doesn't need to be too tight, as it can warp. I use a drill with a 10mm socket, and a little tweak with a socket.