The top comment is what I also suggest! Normally what I do is I go into a bookstore with my phone, and I take pictures of the books that I'm interested in. I take my time, look at what I'd like to look at and immediately leave. My friends make sure that I don't buy anything. When I get home, I look through the photos and I google them and see if they're at my library. I normally get them there, and if I don't read them then I don't end up buying them. If I do end up reading them and they're amazing, I wait until I read 2 books off of my TBR and then I buy it. It's worked for me for awhile! Before that I was buying every book I saw. It was a lot and really hard at first.