How do you exam your breasts correctly?

Hi Fluther!
I“m 40, getting a mammogram and starting to do breasts exams as I’ve never done them.
Feeling my breasts I can feel so many lumps and bumps, breasts are naturally lumpy are they not?
How do you know what a ‘suspicious’ lump feels like when it’s all lumpy on the breast?
Both breasts feel lumpy I should add, not just one and I had my Dr examine my breasts two days ago and she said they felt fine.
So… what am I looking for??