I agree with herenorthere, it's not as hard as it sounds, so long as you find decent directions. I've had good results most times I have tried.
One thing to check is the shape of the flasks. Some sites will sell flasks that you cannot get the plants out without smashing the flask, which can be annoying. I hate picking glass out from amongst the seedlings. But, if you don't mind, it's not going to kill the plants, it'll just take a bit longer to deflask.
Some use baby food jars, which I consider preferable.
I can't say for sure, since it may have been other factors, but I had much worse luck the time I did have to break the flask. It could well have been because of the type of orchid, or care I gave them, though. Either way, I won't be buying from that seller, or anyone that sells that type of flask again. I did however still get a good amount of seedlings, so I'm not saying not to give it a try if it's that kind of flask, just that you'd probably rather know that before they arrive.