Can someone help with temping?

I am new to temping and am trying to understand whether i am doing it correctly. Ideally, i should measure the temp at the same time everyday during my cycle. From what i read i also understand that you should not start doing anything else ( i.e going to toilet, etc). And have uninterrupted sleep for minimum 5 hours.

So, if i follow the two last points, i would temp between 4am and 7 am in the morning. And the temperatures are as shown in the below graph.

I usually dont wake up the same time everyday .

Is this the right way to do it or i a missing anything else?