I guess I'd recommend snorting or smoking it, rather than shooting, if you must do it.
I mean I don't know you, you very may have the will power to do it "just once" and then be satisfied with that, but, like I've said in another thread about the topic, it is a really insidious drug. I did a bunch of stuff prior to meth (cocaine, opiate pain killers, benzodiazepines, etc) which have a reputation for being addictive, and none of that stuff ensnared me, but meth was something else...it just keeps coming back to me for some reason. Even when I won't want it or be looking for it (which is most of the time), someone will say something to me about it and I'll suddenly want it, or an acquaintance will offer me it and my brain will go into gack-mode and immediately snort it up without thinking, which kicks off the "NEED MORE METH!" mode, which will lead to the consumption of more meth, and then I'll eventually wonder "why the hell am I putting this poison in my body?", and I'll be disgusted and ashamed of myself. Urgh! But damn if it doesn't feel good...I guess that's the appeal of it, lol