I’ve got a Kubota L3301 4wd with FEL and filled tires. I generally prefer going forward up steep hills (which the tractor does well). In the old days before I had an FEL and 4wd I would go up steep hills in reverse but generally not anymore with the FEL and 4wd.

I think you will be fine as long as you have 4wd and an FEL will help.