The MOST IMPORTANT thing to do first is consider that

a.) They don't work much at all unless you take testosterone blockers...the t blockers are a significant health risk
b.) they take a long time to work...years, and years....and more years...
c.) their impact is TOTALLY UNPREDICTABLE...

nicole is full of baloney with the idea they are a ripoff...transsexuals take them because the emotional and mental benefits are part of the benefit, they are worth every penny for that..(and they are inexpensive)
you just hope the body responds well...

if you are doing it just for the body effects, you will very likely be disappointed...especially if you don't take t blockers...and unless an inability to sustain anything other than a painful, unorgasmic erection is something you want, you should avoid them