In reply to stretch1486:
I'd say it can work, dependant on your knowledge etc.
If all you want is to equalise anchors then a stone wall is fine, if you want to test it and place meaningful gear, set up an abseil down a 3 foot face. if you wish to climb too etc then set it up somewhere bigger.
Nothing like doing it yourself and then laying your belief on the line.
There is always a lesson to be learnt if you are inexperienced (or experienced). If you lack confidence, doing with someone more authoritive/knowledgeable would bolster you.
Dorset rock can be loose at the tops. Pick stuff you can see isn't detached/shattered to practice on. You will get the same rock at the top of climbs in your area. If in doubt, back it up!
Many trad routes in dorset have stakes, this may be a good place to start - equalising stakes.
Cliff top quarries may prove usefull too.
Have fun, be safe, Kev