First G5 sensor change coming up. Walk me through it

I’m not sure I’m clear on the order for making a change prior to a sensor expiration. I’ve had my first one on about 12 days, but the tape is coming up around the edges, so I’m thinking of changing it tomorrow. In what order do I install the new sensor and abandon the old?

I don’t think it really matters much on the order. I usually put in the new sensor before stopping the old one, taking it off and putting the transmitter in. I do it that way to minimize the time I am without numbers. Really, though, unless you’re planning on putting the next sensor near the site of the old one (in which case, I’d take the old one off first to avoid accidentally overlapping the tape), the order makes very little difference, in my opinion.