First time IV Oxycodone question

First off: I am a long time lurker, and have posted before under different throwaways, so I know about the search function, as well as the advice against jumping into IV usage, just have a quick question

My Background: I have used almost all opiates through pretty much every route of administration (except IV), once had a tolerance of around 120mg of oxycodone (result of 3 months of continued use, and then i weaned off through subs) but have currently not used any opiate in 4 months.

Question: I will be home and capable of getting my hands on some 30mg IR oxys soon, and I have always been interested in IV usage. Is it safe and possible to IV a roxi after using again for only a couple of days and with a low tolerance (i am assuming my toly will be around 15-30mg once i jump in again), will the rush and high be a good example of IV usage of opiates since my tolerance will be low? Most importantly, what should my IV dose be relative to oral/insufflation dose?

People who will advise against it: I know IV can change the whole ballgame- I know my addict brain, I also am only home for a week, then back to school where I don't interact with anyone who uses opiates, have a source for getting any opiates, and never use any opiates, school prevents me from being bored and falling into it. If anything the only reason I want to try IV now is because of these limits. I enjoy sober living, but I also enjoy the opiate outlet, and am very interested in the IV experience. Sorry for the length, thanks