What quicklime said. Other than that, if I simplify my process slightly:
I rarely have time to browse anymore, unless I end up in a library or bookstore for another reason and take a minute to look through (I don't really browse online; it's not enjoyable for me). And my TBR list is long enough that I don't *have* to browse. So how does someone get on my TBR list?
#1: I have to know about the book. This is the hardest hurdle, probably. Since I'm not browsing, nowadays I usually only learn about new-to-me books/authors if they makes a splash in fandom or among the people I follow online (reviewers, SFF people on Twitter, etc.). So popularity doesn't make me want to read something per se, but a certain degree of popularity among people I interact with is unfortunately a necessary condition, as otherwise I just won't know about the book.
(Oh! Now that I interact with a lot of authors online, I also know about a fair few books because friends or acquaintances wrote them, which is cool.
)
#2: Sample. Sample sample saaaaaample. I usually skip blurbs and don't attach much weight to covers. But I'll ALWAYS read the sample (or the first few pages, if I'm looking at a paper copy). And I'm exceedingly picky. If a book doesn't grab me on the first page, it's SOOL (if the book comes highly recommended or is written by a friend, I might give it a little longer, but I can't remember that ever changing my opinion from a "no" to a "yes"). If I like the first page, on the other hand, I'll read the second page. If I get to the end of the excerpt and am still hooked (or find myself just starting to read the whole book, if I'm holding a hard copy), then I want it. The only books I buy without reading the sample are books by authors I already know I like.
I've become a big put-downer in my old age, btw, which I
never was when I was younger. But I'm so short on time now, and there are so many good books I want to read, that I just won't bother if a book starts being the least bit of a slog. For any given library haul, usually half of them will end up returned unfinished. (I feel uncomfortably like this might be a bad quality to have as a person, but on the other hand, I've become a lot more unforgiving of my reading material and am just not willing to push through a book I've become lukewarm on. Eek!)