If your UTG its ok to Make a 3x raise with 66 as appose to something like TJ which you would not want to play! However it all comes down to your stack size and the types of players at your table, implied odds
are big here too!
If your playing at a really tight table I then the 3x raise UTG would probably be good because most will fold and if anybody comes over the top of you, you've got a good understanding that your hand isn't in good shape!
I would suggest watching the Gripsed videos on youtube, he does a lot of cash game reviews and it will basically answer any question you might have! Also very good are his MTT reviews which personally changed my game around!!! Gl onward!