Since you may be new to rigging, it's one of the most difficult things to learn in the 3D world in my opinion. Don't get discouraged, just keep at it and learn everything you can.
You should have controllers in your hierarchy which are easy to find. Many people create easy to select splines (see below). Others the visual selector. Another tip is once you find the one you need often, drag it from the Object Manager right onto your viewport. You will now have a shortcut right on the screen. Very handy for many things.
I posted a shot of a rigging video by the late, great Cactus Dan. See how he put a C for the chest controller, an S for the shoulder and an H for the hips? Easy to select. I don't remember how he connected them, maybe just a simple PSR Constraint. His videos live on here at the Café. They use his plugin, CDTools (based on a Maya workflow), but there is still a lot of good knowledge to be learned from his videos. They are very detailed so be prepared.
Cactus Dan's Tutorials