The way I do it, is to find the flattest surface that I can and lay the paper 'face up' and go at it that way. Careful how much downward pressure you use, you can take off more than ya think, that way. I would go 2 or 3 long strokes and fit and so on, until it matched. Worked for me, but the wood I was working did not have as large a surface as the end of a stock. Anyway, that's the way I have done it in the past.
Cookie