Not sure on your plan but I heated mine with a heat gun and used a good set of gloves.I tried hot water before that and couldn't get them on.Hope this helps
I've done it both ways.....the boiling water method worked better for me.
After I got the boot on the bar, I greased the the bar pocket real well with a small coat on the bar. Then used an open end wrench just larger than the bar up against the boot and hammered it home. Popped right on.