it is very easy to do yourself but you still need to break the bead. I have tried many ways but the easiest way is to take it to a shop. If you call them and explain you just need the bead broke on the tires and ask nicely they might not charge you the full 20 which includes de-mounting and re-mounting the tire. I normally pay $5 a wheel.
then with the bead broke you can remove all the bolts and pop the rims apart. the old O-rings should still be reusable.
Trikes: All Honda: 84 250r, 85 86 and 87 250sx, 84 and 85 125m, 79 82 84 and 85 110's, 73 us 90 and 77 atc90, 75 atc70
Cycles: Honda: 71 cb100, 78 cb750 coming soon cb750 trike. Yamaha: 67 yds 3 (250cc, 2cyl, 2 stroke), 82 750 SECA
Other toys: Chenoweth VW sandrail dune buggy, old race go kart, racing mower, 76 Arctic Cat Pantera 440 snowmobile
KEEP IT ON ALL 3 OR AT LEAST 2 AT A TIME