Hi,
see here why everyone advice you to study tactics more than anything:
http://www.teamleague.org/chessplayer.php?tourney=11&pgn=4851
this is the last game that I lost(45 45 game) against a FM, myself being a 2100 player.
After long maneuvering(some knowledge is needed here too, but not so much) I managed to miss Qa6+ when moving Qc2(Qc4 would have saved the day, I considered it, but I thought Qc2 is the same) 🙁