Trim advice needed

Hi all, I’ve got a Russian tortoise that I’ve had for about 12 years. I just got her back from my ex where she wasn’t well cared for. Since I got her back I’ve noticed her beak seems to have grown ridiculously long. I read about trimming it with toe nail clippers but when I went to do this tonight, I couldn’t get her head forward enough. She got so scared there was an audible squelch when she pulled her head tightly in. I don’t want to freak her out but I’m not sure how to coax her head out without injuring her or making her extra mad. Any tips?