i have done this with my mage and i dont know if it works for other classes but it should.
what you do is, go into your house, face a corner and put it on autorun -- you should be now running into the corner not moving. now, select yourself and use some kind of selfbuff skill -- you should get "Interrupted".. now every so many times you should get "fizzle" which will count as doing the skill, so your skill will go up with every fizzle. I found this out earlier and now have 140/102 ordination,126/102 ministration and 140/102 disruption.
you can also macro this so that you dont have to click the skill to make yourself interupt/fizzle.