In reply to adamarchie:
Hi Adam,
Assuming you have the App, start on one of the regimes, say the 5a or 5b. Any of the hold pairs which you can't hang, use one of the big holds and alternate hands each time, so you're using one big hold and one of the difficult holds each time. Another alternative is to follow the hold pairs in the schedule, but allow your tip toes to touch down to take some of your weight. Keep at it, the strength will come.
If you can attach a theraband to the beast maker and the other end to your harness to take some of the weight, this will also help you progress. You'll have to experiment with the length of the band to get the ideal 'help', then gradually wean yourself off it.
I do a couple of sessions a week, and do two complete sets from the App each time, which works for me. It's made drastic improvement in my leading as well as bouldering. Enjoy, and make sure you warm up thoroughly before each session.