Is this a move that beginners should be doing?
no. beginners should only do bowing, ukemi, and listen to the old black belts talk about kata.
It feels very awkward to me, because I have to balance on one leg.
you're not gonna like the other half-hip throws. or footsweeps. or osotogari. or judo really.
It's a move where I feel like I have no control.
well of course, you just said you had no idea what it was, you must learn, padawan.
I might be doing it wrong.
ya think?
Edit: with harai goshi, I try to 'scoop' his legs up, is this a bad habit?
yeah. you're probably trying to back into them. i'm betting your heel is still on the floor and you're having a really hard time figuring out why you can't move them forward and end up collapsing straight down from the strain of your grip?
you probably need to work on your kazushi to make sure uke is getting out over their toes. it doesn't matter if you practice the leg motion if you don't have the hand technique to use it. you're better off working morote/ogoshi/koshi guruma and osotogari until you're able to stay on one foot.
once i learned why good kazushi and tsurikomi was important, the throws became much more intuitive. i thought less about the throw as a 'move' by itself, but a sequence of events sharing certain key principles with other judo throws.
once you know how to move your hands and footwork relative to uke you have the luxury of using what's easiest or most comfortable. for me, harai, osotogari, uchimata, and hanegoshi are very, very similar throws in setup and principle, and the throw i pick depends on the space and context.
like, the MOTION of the throws is roughly the same, it's the impact and trajectory that differentiate them. maybe the grips too? i'm not so sure a harai with an underhook isn't an ogoshi with a leg reap, and i've never been sure when it becomes ashi guruma/o guruma.
just grab ahold of someone and swing your leg a few thousand times. you'll get the idea.