I breed my own crickets and it is pretty easy to do. Honestly the only problem I've ever had with breeding my own crickets is when I tried to incubate my first batch of eggs I had a little to much moisture and not enough ventilation so I ended up with a very light layer of fungus covering the ground which killed that whole batch. Other then that one time it's been pretty simple.
If you start out with around 250 crickets, within a couple of weeks you will have a few thousand so you just have to be prepared on the amount of space because those little guys reproduce like crazy and if they get over crowded they will each others legs and what not.
Like greenlove mentioned there is a really good article on breeding crickets,
http://www.frogforum.net/care-articl...e-cricket.html
The only things I really do differently then what that article says to do is I think 90 degrees is a bit to hot, where in my experience I noticed I have way more successful hatching's when the temperature is around 80 - 85. From my experience, when the temp is 90 not as many hatch.
Also, I know a lot of people mist down the pinheads or give them water cubes / crystals which I did at first but I found I had more success with damping a paper towel and putting it in there with them because some would drown when I misted the sides down because of how tiny they were and then with the water crystals I would lose a lot because the cubes would be sticky and they would get stuck and die. Where with the paper towel their were no droplets at all and the towel doesn't get sticky.
Hope that helps and good luck!