it took me a long time to get tables down and some would probably say I still suck at them.....
I do them differently depending on what way I lay the bike over. one way I use my arms more, the other way I use my back foot more. but I use my arms and legs for both, just more or less of one or the other, depending on what way I'm laying it over. (that probably makes no sense..)
I would suggest learning them on a hip or bank or quarter first instead of a strait jump like a tabletop or set of doubles. the reason is, when you turn around on say, a quarter pipe, your practicly doing a tabletop, just turn your bars a bit.
and of course, practice practice practice. try to think about what your doing while your doing it.
here is a picture of me from a million years ago.
here is a picture of my friend from a few years back.