Same thing here, and I'm sure that if I had a more consistent thinking process I would lose less games. But it's not only about avoiding blunders, it's also about punishing the mistakes of the opponents. In this point, tactics puzzles are great.
"to learn tactics do i just need to do puzzles here or chesstempo ?"
I guess so, considering that you know all the tactical motifs.
Here's a database of coaches, probably some of them are near you:
http://www.chess.com/coaches
I don't think you need a titled player as a coach, he just should be significantly better than you and know how to teach chess.