I will tell you the old timer way to get a tire off the ground to replace a tire or tube on a bike with no center stand, back in the days when all bikes ran tubes and on the road tube repairs or replacements were to be expected and planned for.
Find a big block of wood or a very big rock, as in a boulder, or a concrete block. The item needs to be taller than the underside of the bike by a couple of inches at least. Put some rags over whatever this item is to protect the paint under the frame. You will need an assistant to do this.
Now, you are going to stand on the left side of the bike, put your left foot up against the rear of the kick stand, pull up and back on the bars and the front tire will come up with very little effort. With the front tire off the ground have your assistant slide the wood/rock/concrete block under the right side of the frame. Slowly put the weight of the bike on the wood/rock/concrete block. Between that and your side stand, you bike is well supported and you can toil away removing the front tire.
You can lift a rear tire off the ground this way too, only you have to brace against the kick stand and pull up under the rear of the frame around the shock. This takes a little more effort to do but a normal adult can do it.
The first time someone told me of this technique, I thought "you gotta be effin kidding me", but it is very easy to do. It doens't require a whole lot of strength, you are using the kick stand a a big lever to help lift the bike.
I have removed wheels at both ends of the bike this way to fish out punctured tubes on the side of the road. I used this method at home on my first bike for tire changes and chain maintenance before I more fully tooled up. It is a skill well worth practicing even if you have a nice pretty yellow Sears jack because you never know what weirdness is going to happen to you on the road.
