Work singles with rest up to 5-8 with 5 minutes rest between sets
Then you can start decreasing rest times between sets, usually by 30-60s over a bunch of workouts
Once you get to around 60-90s rest, you can usually do a couple of doubles with full 5 minutes rest. The finish off with singles.
Then try to go for all doubles. Then decrease rest time again,
Basically, it's counterbalancing intensity and accumulation against each other... I worked up to 3 sets of 4 OACs on each arm doing this