How can I teach my cat to retract her claws when walking on humans?

I'm a new cat owner of a really beautiful and playful 6-7month old Russian Blue. The main issue I'm having with her right now is whenever she decides to walk on my lap, or across me when I'm sleeping, she does so with full claw extension. I end up getting cuts and sometimes she wakes me up because she... show more I'm a new cat owner of a really beautiful and playful 6-7month old Russian Blue. The main issue I'm having with her right now is whenever she decides to walk on my lap, or across me when I'm sleeping, she does so with full claw extension. I end up getting cuts and sometimes she wakes me up because she walks over me when I'm sleeping with her very sharp claws. Is there anything I can do to train her not to do this? Will trimming her nails help? Thanks!
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