Different situation, but I was on here recently desperately trying to find a way to have four broken molars, including one possible root canal, fixed and wanting to find a specialist NHS dentist that deals with phobic patients.
As it turned out, I found out I had to re-register at my old dentist's surgery to get the referral to the specialist centre. Went to my first appointment and the dentist was so lovely that I decided to give it a try having the work done there.
Turns out it was nowhere near as bad as I thought, just two small fixes on one side, a filling replacement where I had assumed I needed a root canal and the crown putting on top of a root canal I had done years ago, but never went back to have finished. That still seemed like a lot of dental work to me and I was still really scared, but agreed to give it a try.
Had my first appointment and he did the first two easy fixes. As he was drilling into old filling and just filing the edge of the tooth for repair I managed to do the whole thing with no anaesthetic at all (I have problems with local anaesthetics working). It only took 15 minutes and although a little uncomfortable (not the tooth itself, more having my mouth open, saliva swabs etc, in fact the worst bit was when the nurse got the suction thingy stuck to my lip!
) there was absolutely no pain.
I have an appointment to go back and have the other two teeth fixed next week and am obviously nervous, but no longer terrified. If you'd asked me a couple of months ago if I'd have had all this done I'd have laughed, but the good appointment has reminded me that when I had my root canal done (under my maternity cert 7 years ago) the same dentist was awesome, there was absolutely no pain, he kept my anaesthetic topped up all the time and was very sympathetic, stopping when/if I needed to (he gave me a hand signal for if I wanted him to stop).
I feel so stupid for not going back and getting the crown done at the time now, but my mat cert ran out and as I had a temporary filling on it that lasted until last year, I convinced myself I could get away with it and we couldn't afford it anyway.
I am so glad I went back and fully intend to stay on top of it with regular appointments from now on - and I speak as someone who went first 17 then 7 years between visiting the dentist.
The first thing you need to do is book a registration appointment. They should have a look at what needs doing, probably take a couple of x-rays and talk you through a treatment plan and the costs involved. You absolutely do not have to commit to anything at that point. You can go home and think about it or try another couple of dentists until you find one you feel comfortable with.
Honestly, you couldn't be more scared than I was about it all and I swear my root canal was painless and also such a relief after having so much pain in that tooth.