The most important thing is to make sure you like the therapist and are comfortable with them. You have a long journey ahead. I personally would suggest finding one that specializes in transgender therapy, and is already familiar with the road ahead. My personal opinion for using your current therapist would be like the blind leading the blind. I wouldn't use a heart surgeon for brain surgery

... Anyway, try to get in touch with other transgender individuals in your area, through support groups, Susan's, etc. to see if you could get some referrals from other individuals that have experience with a particular therapist. Finding a good therapist is critical. Then, presenting as your desired gender from day 1, being confident and knowing exactly what you want, what to expect, knowing the risks and possible repercussions, and having the correct game plan and support system in place will get you well on your way. And get yourself out of the fastest way possible mindset, that will most likely hinder you since that's an irrational thought process. Good luck!