Can anybody fill me in?

I'm thinking about buying opks. Can anybody tell me how often they get used (like how many days do you pee on the stick), how much they cost, do you find them to make you feel more obsessed with the process or more at ease, etc.?? I got pregnant the first time monitoring temps and cm but I don't think I ovulated this month and I'm thinking opks might help. . . Idk Oh and how many to buy and best brands??!