Cleaning Thermometer & logistics

Hey ladies! 
I'm going to starting charting my BBT during my next cycle, and I'm a little nervous about it. I have a couple questions: 
Do you clean your thermometer? How? 
Is it awkward temping with your partner in bed? My husband is super supportive and involved with everything, but it still feels a little awkward. 
Do you just insert the thermometer a bit, or as much as possible? 
Thanks in advance for any comments!!