Note also that depending on your level, selling back your enhancements may be a big deal.
At level 47, I'll have a lot of 45++ Enhancements that will go to waste if I just replace them with 50s. With a properly-timed respec, they won't go to waste. I can even save 10 nifty ones to give away.
And save that free respec if you can!
The fact that they can be used on demand makes them uniquely useful.
At one point I completely turned around a failing Task Force by spending 5 minutes with /respec. With those famous heroes Recall Friend and Mutation on our team things suddenly improved!
And yes, DO YOUR RESPECS ON TEST FIRST. Over and over if needed. You'll be glad you did!
Thanks for the guide! Good hunting!