I think that you posting this shows some amount of precaution for what you're about to do - you're only in the planning phase, and haven't yet used the drug. Planning to use drugs can sometimes feel like a high itself. You take those urges and cravings one step further, and think about how great it's going to be once you're finally able to get what you want. I can tell you from my experience that I always had ideas about how I was going to use "this time" - only take oral doses, no vaping, limit use to a certain amount, etc. The problem is that once I get the drug and get it in my body, all of that planning and preparation goes out the window. Once I got high, I would feel so conflicted and shameful, that I'd just use until it was gone and I could stop the nightmare. If you're like me, that gram bag will be gone almost immediately, and you'll be left a blithering mess, full of shame and self-hatred, and too high to do anything or talk to anyone.
I think part of the trouble is being in between worlds - enough knowledge and education to see what being clean is all about, yet enough experience with using drugs and living that lifestyle that it's easy to put the old coat back on. I tried to live in between for a long time, and I ended up with nobody on my side and nothing to show for my life. I think it's normal to have cravings and urges, and start planning to use drugs when things don't feel right. Your mind will try to deceive you every step of the way to get what it wants. I've been clean for over a year and just had a dream about using meth and dissociatives two nights ago. It still happens, and I don't know how long it'll go on, all I can do is make the choice to not give in to that temptation, if only to avoid the hellish consequences that will result from my choosing to use again.