Some things are just hard to do unless you have a gift for them. So to get good, you work at them and take tips from as many people as you can talk to that know how to do it. So I'll give you some good tips of my own that helped me out.
Lets work from the ground up.
Your forearms. Your ability to grip the ground must be substantial. Both sides of your forearms need to be equally strong according to their proportions to balance out the resistance required.
Your Triceps. Without the power of your triceps, your elbow/elbows would simply buckle and you'd fall over. So make sure to practice and make yourself better with a series of tricep strengthening exercises. I do not advise that you go for weight training with your triceps for hand balancing, for strength and size, you do weight training, but with hand balancing, you can body weight muscle isolation while you work out other muscles. Everything is meant to be worked out in groups.
Your shoulders. Your deltoids are incredibly important. Your shoulders are the other part of your arms that decide how long you stand. So work those out, by standing on your hands.
Your core. So in hand balancing, say you're standing on one hand, there are two parts that hold you up and steady. Half of it is your arm, and half of it is your core. Believe it or not, your arm may be the thing holding you up and off the ground, but your core is just as important. Without a strong core, you'd be all floppy and fall over. So, do core strengthening exercises, those are important, and do stupid things when you practice hand balancing, not things that'll get you hurt, but try out new things and those will make you stronger and you'll be able to hold those older positions better than you last were as you progress into the newer ones.
Another thing I learned when getting into hand balancing is that you need to thrust your chest out, and arch your lower back as much as you can. Naturally your body will hold at an angle when standing on one hand because when standing up with something above your head, your back muscles are required to engage, but when you're standing on one hand, it's different because your upside down and you're balancing something much larger than plates of metal put on the ends of a metal dowel.
It's also good to have considerable leg flexibility unless you're incredibly strong and can just hold yourself up without a problem. You should be able to attempt the splits and at least be able to have no more than five inches between the ground and your groin. So you may have to stretch before you get into hand balance practice.
I'll say that your entire body is like a giant box of pineapples as far as weight dispersion goes. But luckily we've been designed to balance that awkward weight different muscles put just in the right place at the right time made to work on cue with the proper amounts of energy being produced.
Following these tips will you help with getting things like one handed handstands with a foot tucked in, lotus one handed handstands, flag freezes, hanging air babies, and if you're a nutter, one handed planches. Which I'm actually working on, so just for you to get a little inspiration going here for your one handed hand balancing, go on ahead, try to learn it before I put up a post.