ya gotta be kidding us, right?
(please see last paragraph for my true comment... otherwise, please read full post for tire removal/installation)
The tuff-est part of removing a tire is whats called "breaking the bead"... that's where the tire meets the rim/wheel. With the wheel off of the car,and laying down flat on its side, downward force has to be pressed on the tire near the rim (bead). There are TWO beads per tire, inboard and outboard. I give you my best wishes! Do you see where I'm going with this? NO? --- okay
After that you'll need help. Insert a prybar between the rim and tire and pull the tire over the rim. A SECOND prybar will be needed to do the same. One person holds the first prybar as the second person whales on the first prybar with a big ole' hammer and 'works' it all the way around the rim. Your gonna have to do this 8 times. (4wheels X 2 beads=8) Do you see where I'm going with this? NO?-- okay...
You should replace the valve stems because they're cheap insurance for leakage. There's a special tool that 'threads' onto the valve stem that pulls the old stem out, and installs it the same way. It cost about
20-25 bucks. If you don't have one of these special tools, you can cut the old stem off with a razor/knife from inside of the rim area. Just cut the 'fat' part of the old stem on the inside of the rim as close as possible. But, re-installing the new stem will be the trick... because your going to have to use a pair of pliers, or something to pull the new stem through the hole WITHOUT damaging the new stem. Cutting it will mean certain air pressure loss, and soon, tire failure. Do you see where I'm going with this? NO? -- okay
NOW is the time you've been waiting for... installing the new tires. I'm not sure of your vehicles age, but sometimes cleaning the rim where the bead of the tire meets the rim is good insurance too... use a stiff wire brush. Clean it all the way around (4 rims x 2beads = 8) There is also a chemical called "bead sealer" that will help insure the bond between tire and rim.
Installation is about the same as removal. Two people, two pry-bars, big hammer... BUT WAIT!... you're going to need some rubber lubricate... liquid soap will work just fine. Spread it all around the new tires bead. There's usually a small dot on the outside of the tire... sometimes red, yellow or white. Align that 'dot' with the the valve stem. Good luck and my best wishes! Do you see where I'm going with this? NO? -- okay
Assuming you now have your new tires installed on the rims, without totally destroying them, how are you going to inflate them? I have seen rock-crawlers and artic guys inflate tires by spraying starter-fluid inbetween the bead and rim, and then "flicking-there-Bic"
--BOOM!-- (I didn't say this .... Don't try this at home kids, but a man's gotta do what a man's gotta do, I guess). Do you see where I'm going with this? NO? --- okay
Then you have to balance the wheel assembly. Again my best wishes. There IS a special tool that rest on a pendulum, with a bubble gauge much like a carpenters' level. You place your wheel assembly on-top of the balancer, and then 'tack' wheel weight onto the side that the 'air bubble' is on... it cost a few hundred (US) dollars and is VERY primitive. Do you se where I'm going with this? NO? -- okay
With all of the modern technology present today... paying an automotive technician fifty- bucks to mount and balance your wheels is very, very cheap!