How do you get your patience back?

My partner and I have had a 4.5 month old Beagle/Border Collie mix for about 3 weeks, and while she's a very sweet and rambunctious girl, certain things have started wearing me down.

I'll preface by saying I've read a lot of the resources here, understand what to expect, and don't think any of her behavior is outside of normal high-energy breed stuff. When we first brought her home, I approached training and activities with a lot of patience, calm, and diligence. As we've settled into our new reality, though, she's gotten more comfortable and has definitely started testing our boundaries with things such as repeatedly jumping on the couch (where she knows she's not allowed) to farm treats when she jumps down to the "off" command; or barking when the crate door is closed despite happily going in there on her own accord. I've noticed myself becoming shorter and less tolerant, and I want to get ahead of that because I know the best thing for training is patience and consistency.

So my question is, how do you get that patience back once it's been worn down? It's not like there's days where I don't have to deal with her behavior to allow it to recharge, but I also know I need to be fair to her. Tips or commiseration appreciated.