@jinty73 if you haven't already you could enable the 'professional' mode that allows you to use the libre to calculate your bolus (only if you use it to do blood tests as well) it then gives you the little yellow man symbol which will allow you to see how much insulin you already have on board - this will allow you to work out if you might need an insulin top-up or not and avoid 'stacking'.
Most people do find they are surprised at how up and down their BG levels are using it for the first time, and the majority soon work out that pre-bolus'ing helps, and also not to over treat hypos and also catching a low before it goes too low.
I'm a reactor to the adhesive, I wasn't to start with but about 3rd or 4th sensor in I started to itch and sensors left a red mark, they also weep and then become loose and fall off - Abbot are very good at replacing sensors that 'fail'.