Gir did fine when I clipped her nails the first time, until I got to her last nail. I accidentally clipped too far, and made her bleed. I was so upset with myself

She does just fine when the vet or the groomer does it. Because she is a large pit bull mix, the first time I took her to get them trimmed, the groomer looked scared, but she told me that Gir was very well behaved, and the vet has never had a problem...no muzzle or restraints needed. I wish I could trust myself to clip her nails by myself again, but I know that because I am nervous doing it, that would transmit itself to her and cause her to be scared of the process. I don't want to do that.