Make sure the rope is not hanging up. I've had that happen. To check, pull the rope slowly and see if it pulls all the way with surges of compression. If it hangs up hard pulling slowly, release and try several times. If it hangs every time, it could be the rope recoil ball ratchet. But before removing anything check to see if the engine is stuck. Remove the spark plug wire and remove the spark plug. Lay the mower on its side, gas tank up to prevent fuel spillage and with gloves slowly turn the engine with the blade in the direction of the cutting edge. If it hangs up the engine has a problem. You should hear compression coming from the spark plug hole, if not, engine problem. At your experience level take it to a repair shop. The rope recoil fix is simple, the engine, a crap shoot. An electric may be OK for your small lawn, but get a good one. Good Luck!