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For anyone 2 alcohol swabs, one for the vial and one on the body, aspirate before injecting (if you see blood try a different spot, yes it hurts but HRT isn't intravenous) and make sure to rub the area for a min after for all the oils and put a bandage (optional) to keep the area extra clean. Never do a shot to the backside of the legs since you have all sorts of nerves there and its how people/animals would get paralysis after shots. Always use a clean needle when drawing since that's how you get icky infections otherwise.
Would look up an IM (intramuscular) injection guide, they used to have vids of nurses giving people thigh shots, that's probably one of the easier ones to DIY. Subq (subcutaneous) uses shorter needles and you can get away with the stomach, very similar to insulin shots, though absorption rate is slower and I'm not sure how well that works out for E.
Install windows and do disk size management on its size like others mention, it will break linux's boot loader (and even its own) with one of its updates. Then I take the new fresh chunk of empty space/drive and run that in linux and just follow guides for the OS I'm trying out. You can do a dual boot on one hd just backup your files every day since windows always comes for linux (and will corrupt its own mess) in a long enough time period.
I have some sort of backup disk usually that both systems have access to or I use portable storage.