For getting on, try getting a ski boothorn which costs about $10 or so, depending on shipping; or if you're really on a budget you can make your own out of some kind of slippery plastic. You can find instructions or youtubes how to use a boothorn; but notice you place the boothorn not all the way down, so both the boothorn and your foot slide down giving 2 sliding surfaces.
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If this isn't enough, you have a really tight fit, and you need more advanced techniques such as working with the liner out of the boot.
To remove, there are several techniques, but the one I know of that seems to work best is the following that make best use of your skeletal positioning so you aren't fighting staying in balance.
I am not sure where the best youtube for this is; if someone finds it they can recommend to you. You may first need to practice this sitting down before you can do it standing up.
if you are just 1 person solo; You will cross your leg on top of your thigh to givve you a strong platform.
Then you will using your hand, you pry the boot off from the back cuff off, the mental picture is to think like how a bottleopener levers off a bottlecap. Some people may have luck luck plantar flexing (pointing toes out) others might have more more luck dorsiflexing (locking the foot, toes up) works better to counter against the motion.
In general, most of the techniques I believe use this same motion, like a bottleopener; where the forces are directed at levering/rotating the boot around the heel; with pressure against the tongue, and not trying to not pull away/off your leg. If you have friends to help open up the tongue or so that helps.
When you get better, or when your boots pack out, you maybe be able to do this standing up, and/or without crossing your leg on top of your thigh
If your boots are so hard to put on though, that they require more advanced technique than a boothorn to get on though; you will also need more advanced techniques to get them off.