I put my sensor in 24 hours before activating it to help it be more accurate from the start.
I don’t know how this would work for those who have a lot of hair on their arms, but I use Skin Tac liquid underneath sensor and patch, with a Simpatch on over it. I use a Simpatch (breathable cotton like patch) that covers the whole thing and use a paper punch to punch a quarter inch hole in it for where the hole in the sensor is, because that hole should not be covered. I like the ones that cover the whole thing because I feel it protects the sensor from being knocked off better than the ones that don’t cover it completely. It gives a smooth transition around the sensor so there is really not much chance of something, like a shirt coming off, snagging it or knocking it off and no worries it will be rubbed off while sleeping. Doing these things keep my sensor firmly attached for about 16 days with no problem. I also put my sensor more to the inside of my arm, to avoid it being bumped on things and to avoid laying on it while sleeping.
When taking it all off, I just slowly peel the patch off while holding the skin down right next to where I am peeling the patch, otherwise it hurts, but with holding the skin down, there is no pain. I then use Uni-solve liquid that I put on a cotton ball to remove the sensor and whatever sticky is left over. I just rub it all around the sensor where the adhesive is until it starts to come up, then I squeeze some Uni-solve under it and keep doing that until it comes off. Doesn’t take very long for it to just slide right off and using Uni-solve makes it so there are no marks on my skin when it comes off.
The Skin Tac and Uni-solve comes in liquid and wipes, but I think the liquids are cheaper and I feel easier to work with. I got all those things from Amazon.
The reader reads really low for me when I am under 100, which I usually am, so I prefer using the Android app Glimp over using the reader. The readings I get from Glimp are usually much closer to the readings I get from my meter, than the readings I get from the reader, especially in the lower ranges. That is the case even without calibrating it, but it can be calibrated if it isn’t giving readings as close to ones meter and they want it to. It has worked really well for me when I calibrate it. With Glimp I can start getting readings as soon as my sensor is activated, no 12 hour waiting period those of us in the US have, and I get readings for 14 days. I also really love the larger, interactive graph Glimp has as it is much more informative than the graph on the reader. It lets you get the exact level you were at for any specific time in the past just by touching the screen on the phone for that specific time, which I think is very helpful. Glimp has many other great features too, including giving your standard deviation and estimated A1c and hourly averages. To get those hourly averages, you just touch the categories of morning, afternoon, etc, and they will drop down, but if you have it set to the dark theme, you have to switch it back to the light one to see those hourly averages since they didn’t change the color of the font for those, so it is black on black, lol.
I use the reader for quick general readings, mostly just to see if I am holding steady or rising or dropping as the trends do seem accurate for me, but I rely on Glimp for my actual readings. In my opinion, Glimp makes Libre awesome.