It's important to get used to the metronome before using it during performance. You'll find that it takes some getting used to. In particular, you'll learn to observe the metronome and recognise you are slightly off tempo without actually changing your tempo.
Firstly, here is what NOT to do. Avoid making sudden changes to your tempo. This sounds horrible and throws off the other band members.
These steps work for me:
Try not to stare at the metronome. You need to keep communicating with the rest of the band.
Like all technology, one day it won't work properly. Make sure you have an alternative process and practice it too.
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