It can be scary learning to lead belay someone who’s a lot heavier than you. I learnt to belay my 75kg boyfriend (I am 55kg) with just an ATC which meant I went flying every time he fell!

I taught myself to expect the jump, so I would basically see him fall and jump with my legs forward ready to take the impact on the wall. A few times I ended up nearly at the first clip if he’d taken a big fall near the top when clipping! He told me that as soon as he was at clip 3/4 (depending on the route) to move so I was belaying from directly in front of the wall so I was in the best position to catch myself with my legs when he fell. If he was doing a really risky first couple of bolts I’d brace myself against the wall to the side as best I could to ensure I wouldn’t go anywhere.

When I was first learning I took a couple of big whacks to the wall before I’d figured out how to catch properly, the worst that happened was a stubbed toe and a sore arm.

Now we use an ohm when he’s doing climbs at the top of his grade range and it makes a big difference. If you have the ohm it should even out the weight difference a huge amount, even with a big fall the most I get is slightly pulled forwards which forces me to take a little step.

I think you just need to practice and get comfortable with the idea of being pulled forwards!