If you mean albums like this (or any shape)
Page 2/3 - Mini Book of Daughter By Lmcnabb
Front Cover Mini Book By Lmcnabb
Mini Book Page 2/3 By Lmcnabb
I glue the album page to the paper. Let it dry and then cut around using a VERY SHARP craft knife - that way you don't have to press too hard on the knife and you are less likely to make a mistake.. I then use fine sandpaper to smooth the edges.
Hope that helps - also try the website of the manufacturer - as I find often they have step-by-step instructions for some products.. :-)