It's been a long time since I looked at any official Minimed guide, but I think they recommend inserting at a 45 degree angle. Most of us who have used it for a few years find that going in deeper, more like 60 degrees, is better. It all depends on how much extra padding you have at the insertion site.5) Insert the sensor as explained on Medtronic user guide (also tutorial videos are available at Medtronic). Wait until any bleeding stops.
I put a piece of tape straight across the plastic base of the sensor before I attach the transmitter. I use Hypafix, so I put a strip of Hypafix over the sensor and then cover the entire thing with a 4" x 4" square of Hypafix. My sensors stay very stable this way.6) Secure the sensor with extra strips of tape. This is NOT optional. Place one at the top side of the sensor and one at the bottom vertically, in a criss-cross pattern and make sure you do not cover the connector.
Since I never start a sensor 2 hours after inserting it, I just insert the sensor, immediately attach the transmitter and tape it all down. I do not turn the sensor function on in my pump. 6-8 hours later I turn it on and within a couple of minutes at most it will ask for a calibration. I tend to insert a new sensor at night before bed and then start it in the morning, or I insert in the morning and start it up before dinner. If I try to do a first calibration sooner than 6 hours the results are almost worthless. They go all over the place. They will settle down eventually but I find it better to just let the sensor sit and get wet for a good long time.7) Wait for 30 minutes.
8) Connect the transmitter and make sure it secures all the way in. If the green light doesn’t blink within 20-30” then disconnect and charge again (read step 4). If you repeat the above process several times and nothing happens, don’t worry. Most possibly, the sensor is not ready yet: Put the transmitter back on sensor and forget it for 8-10 hours. Then, charge it again and put it back on. 99% of the times it works!
9) When eventually the transmitter blinks, meaning that everything is OK, then connect it to the pump. Cover the whole spot with transparent film to prevent infections and water (though at hot summer days, expect it to come off)
11) Try to keep your glucose low. This is good for your health and also extends the life span of the sensor up to 7 days in total.
I don't know if keeping your BG low actually extends the life of the sensor. What's the reasoning behind your statement? Also, I'm disappointed if a sensor only lasts 7 days. I average 12-14 days but have had many that lasted much, much longer. I recently had one that worked for 44 days before it died suddenly. Before that my record was 34 days. That is unusual, but I have had plenty of sensors that worked accurately for 3 weeks.
Everyone has to do what works for them. Some people worry about infections or the site becomes uncomfortable but I haven't had anything bad happen to me in the 3 1/2 years I've been using it.