250 feet in 1/2 mile is a steep hill. About 9% I would not be worried about walking up part of that as a newbe. You are doing great. Keep at it.

One thing you could do if it is safe without much traffic, is to criss cross up the street to cut down on the steepness of the hill.
2 Stand up on the pedals for a short time but sit back down before you are exhausted.