A few tips I have learned thru my experience are:
1) dismounting/mounting- (if it is hot outside, let the tire sit ouside for a while to heat up), the rubber seems to be more flexible (not always possible tho)
2) dismounting/mounting- with or with out tube remove valve stem
3) dismounting-I use a slide hammer with a semi-curved tire end to break the bead
4) dismounting/mounting- I always use a dish soap to make a soapy solution, NEVER NEVER NEVER use an oil based lubricant on tires, it breaks down the rubber
5) dismounting/mounting- motor cycle tire irons work best, (my own opinion) they are thin and short, my set has never broke got them at the local bike shop
6) Sealing the bead, leave the valve stem out, use pleanty of your soapy solution to allow for the bead to slide easily... never use ether, or some other type of flamable solution to seat your bead, find someone with a devise called a cheata. that would be for those of you who don't use tubes... But in lawn mower racing I have found that tubes are essential..
Hope this helps, tires can be difficult, be careful, and most of all have fun..
on section 6 once bead is set get that valvestem back in sorry