Music and audio production

I've been getting in to sampling more over the last couple of years, as I've moved to focus more on hip-hop. Really keen on grungy boom-bap beats, and I'm enjoying the workflow of having samples limit my knob tweaking.

I do find actually finding samples a struggle sometimes, and also knowing how and where to use them. Trial and error works, eventually, but sometimes the error part drags on and gets a bit off-putting. So I'm wondering about approaches or ways of thinking about it that might improve my hit rate.

Any thoughts/tips/questions/rants?

Edit: to be clear, I'm not only interest in hip-hop, or hip-hop suitable sampling approaches. I'm interested in sampling methods for any scenario.