Always a good thread for opening that "can of worms".
I have used them and I will use them again no doubt. That however is ME, as for your decision on if you should do it, well....... only you can make that call sunshine.
If you do decide to do it consult your doctor, he will initially advise against it but if you are determined to do it they will help and advise. Do it clean too, register with your local needle exchange and they will supply you with needles, syringes, sterile wipes and syringes, plus any info you require. Ie where/how to jab. Dont be afraid to ask, its for your own good so if your not sure then mention it.
Have a look at these steroid profiles
http://www.bodybuilding.com/fun/catsteroids.htm
Just scroll down and click on the one you want to know about, it may help you out a little.
Good luck with whatever you decide to do matey.
Ian