Easy, now I did it around 7 years ago in my bedroom at my parents (haddent moved out yet) I used a clothes peg dipped in 90% alchol to steriliize and some more to clean the skin.
The trick for me was I couldn’t push it in to begin with the only thing I can say about that was it was almost a subconscious mental block. It was like my body didnt want to injure its self but once that was passed was quick and easy.