So...having learned how to do it yourself I bet you will agree with the rest of us when we say bring it to a professional.
I turn wrenches for a living in a large, fully equipped shop and I still take my bus tires to an OTR specialist to get the tires dealt with. Sure, I can do it at the shop, but it just isn't worth the effort and risk on my part. Ultimately I'd like to find a tire and rim I can carry with me. I can handle swapping a mounted tire, but mounting anything more than a skidsteer tire gets to be a little hairy for me.
Kudos for taking the challenge and getting it done though! What are your fears about your tires in the future?