LEEP for Grade 3 abnormal cells...

Carly • Scorpio ♏️ Happily married 8/19/18 💍 Baby #1 8/17/19, Baby #2 due 11/7/21
Hi all. I'm scheduled for a LEEP on 11/3. 
I had an abnormal pap (my first one!) back in June and they called me in October to say I needed a biopsy. I went for the biopsy 10/7 and it came back showing "severe" cell abnormality. My understanding is that this is considered "grade 3." 
My questions are as follows... 
Are these cells considered pre-cancerous or just "high-risk" for cervical cancer? 
Any advice from those who have had a LEEP? I'm taking the next day off of work and will have the weekend to relax.
Were you put under for it? I won't be; they told me just to take Motrin beforehand. 
Obviously, I will ask my doctor these questions when I get there, but I wanted to see what you ladies had to say. 
Thanks!