I've been on my own for a few years now Falconbird and although I manage, there are times when a little bit of loving support is helpful, however if there's no-one to come with you, just be your own 'best friend' and promise yourself a lovely treat afterwards...that's what I do, I lie in the chair and 'project' myself half an hour hence, when I am going to do (whatever it is that falls into the 'treat' bracket...usually not food or a nice coffee due to the anaesthetic, but you get the gist!). I visualise choosing whatever the treat is and just keep breathing slowly whilst reminding myself that I've had five children and that this is a doddle by comparison!
My previous dentist had a wonderful poster on his ceiling and I used to try to imagine myself into the picture, which was a lovely green paradise...anything to distract yourself from whats going on. And remind yourself that your dentist does this countless times each day/week and that you are going to be just fine.
My old dentist was a dream, he would talk me through exactly what he was doing, as he did it, so that I wasnt surprised by his perhaps moving position, or cranking the chair up, or whatever. I had several teeth out and honestly found it quicker and easier than having a filling...the thing it, it doesnt hurt, you won't feel pain and it will be done before you know it.
I've now moved to a new dentist who is very fast and efficient, haven't had any extractions yet, but when I do, I'm sure I'll use the same techniques!
Come back and let us know how you got on...and start planning that 'treat' whatever it is! And btw, you are human, not feeble at all!