Well there is some risk. I have done it and I think it is easy. I can give you some tips and if you're not comfortable I would suggest take it to a vet. The main danger is letting any yolk from the egg drain into the females inside as it could cause infection.
Use a needle large enough to take the yolk. I don't know gauges, maybe a millimeter. Use a syringe that is large enough to hold all the yolk from one egg so you don't have to go in twice and so there is not alot of yolk left to drain out after the first insertion. Do the egg closest to the vent first, obviosly. Be sure you have the snake steady so it can't wiggle.
Lastly be clean in everything and make sure you have an absolutely clean cage to put the snake back in when your done.
That's about all I can tell you, I'm not a vet or anything. I just learned from books but you may want to take it to the vet the first time and watch the procedure then you should be able to do it yourself the next time, hopefully there isn't a next time.