She does mine, now I have to do hers and I'm terrified

My partner has been doing my feet for me for about a year, mostly because she is good at it and I am hopeless. This weekend she asked if I would do hers for once, which is entirely fair and also mildly alarming.

I have watched her do it plenty of times but watching and doing are not the same thing. I do not know what order things go in, how short to cut, whether I am supposed to do anything with the cuticles, or how hard is too hard on the rough bits.

Assume I know nothing, because that is roughly accurate. I would quite like to not hurt her, and I would very much like to not be the person who ruins a nice evening.