Is it okay to leave the water pressure on using a garden hose and turn the water off by just the sprinkle nozzle? My water faucet is difficult to get to.
It is certainly OK to turn off the water at the end of a hose for short periods. If you leave it on this way for long periods you are stressing the hose which could lead to a ruptured hose when you are not around. This could lead to a waste of water or to water damage if the hose sprays on something.
In addition, this could lead to a leaking water valve because the stem packing will be under pressure. The usual valves have a seal around the rotating (multi-turn) stem, but if the valve is a "ball valve" (90 deg on-off), then this doesn't apply.
I think it is best practice to shut off the valve on the pipe when you are finished using the water.
I would not consider it a good idea for several reasons. A quality hose will normally contain the pressure from the supply be it a well or municipal supply. If the hose in in direct sunlight the pressure can increase to the bursting point. If you have a back flow preventer included in or added to your spigot the pressure will increase rapidly. If you don't have an anti backflow device you could push the water from the hose back into your house plumbing.