we have a 20 ton press at work. so far I have been able to press anything I wanted/needed but the others haven't been so lucky. Or skilled, maybe. I take my time to support the item I'm pressing in or out, and fabricate what I need to press stuff in cleanly.
At a previous employer we had a 40 ton press, but there I worked on HD vehicles. That press was great though. Same principles apply though, get everything straight and inline.