I'm not very good at planning for more than a few weeks, and I always tend to overdoing it, so I've been overtraining for years probably, in the past. The problem is that I love training, there are so many physical abilities to improve! Anyway, I think that the key factor is intensity. If you keep that quite high it's harder to get into overtraining, because you're forced to kill volume. I usually train four days a week for climbing, but they could be three or five, depending on how I feel and what I want to target. When trying to improve power endurance I often add one extra session.On rest days I do only a finisher, see the related topic for info. Other key factor is not getting too anxious about planning. Knowing your aim and following your body is a good way to go. To train often and on consecutive days you need to have multiple sessions ready to be done, taking into account time, stress, fatigue and so on. For each tool (fingerboard, campusboard, wall) you should have as many different sessions as possible to target different qualities, prevent adaption and fight boredom. After a heavy fingerboarding session, the next one can't target the fingers as well, so no campus board, no fingery stuff on the wall, but maybe campusing problems with big moves on good holds, or working on core tension, or bouldering on slopey holds, etc. I usually separate fingerboarding, core and bouldering. Fingerboarding comes first in the week, then bouldering. When bouldering I have power sessions earlier in the week, then power endurance ones and I never have endurance sessions. That's probably why after one year and half I still haven't climbed my 30 moves long circuit... Hope this helps.I have to say that all my session are generally short, or very short.