What my dad told me to do which was very helpful was to go to a completely flat parking lot and slowlyyyyy let out the clutch with no gas and get the car moving that way. Doing that gives you a feel for exactly where on the pedal travel the clutch engages and how much travel it takes to go from 100% disengaged to slightly engaged to 100% engaged. Then, depending on what kind of hill you’re on, how much room you have to “roll back” and how much a rush you’re in, change the speed of the clutch engagement and add more gas the faster you engage the clutch.
Like everyone else said, its real hard to explain. But try out that thing in the parking lot with no gas, I think that helps.
There’s really no flat streets in my city, it’s a shithole filled with slopes and potholes so I am somewhat used to going up a hill, but like I said I just need improvement which I’ll get down eventually.