Neutering, compared to other surgeries, is fairly non-intrusive and pretty easy, so your boy should come out just fine. If your vet offers it and you can afford it, I would do the pre-surgery blood panel, just to assure yourself that all of his organs seem to be working properly so that possible (rare) problems with anesthesia can be more easily avoided. Its not necessary, but one of those nice things to do just to eliminate the what ifs that I hate so much.
I also forked over the extra money for them to put a line in Chay so that any potential problems could be easily and immediately treated, since I knew that some Birmans were sensitive to certain anesthesias. Talk to your vet beforehand too, about the procedure and the anesthesia used, just to reassure yourself. Most vets, or at least the techs who are also usually pretty knowledgeable, are glad to talk to you to answer any questions you might have. But I think its normal to be a little nervous - we've all put our babies through this too, so we know exactly how you feel!