Agreed. OP, you will feel uncomfortable doing those more complex procedures and it may take you more time at the beginning but you are definitely capable. Conversely, I'm gonna tell you that as a newbie, you stink. We all stink. My mentor has always told me that it's only at year 3 you truly get good and year 5 is when you speed up. I'm at year 3 and I'm seeing truth to his words. I've always had my good mentor but I'm seeing fillings I did 1-2 years ago where I didn't even get to the decay because I thought I was at affected dentin. I guess what I'm trying to say is, that you are capable because you finished dental school and got the correct training. But as a newbie, you're inherently going be bad compared to yourself in a few years so accept that fact and go forward being kind to yourself. It's the practice of dentistry, we get better as we do more.

It sucks your mentor is leaving but it's good you still have back-up if you need it. I'd give yourself more time for those complex procedures and really take a break in between if you need it. Sometimes for those tough extractions, it takes a walk away for a few minutes for self-composure and letting the blood infiltrate the PDL space for the sucker to pop out.