Well, alot of my trails require uphill for the first half. I can manage the first four gears in the back but thats about it. This technical isht is killer on anything above the third gear.
then pick one of the gears below the third gear. Just 'trying' not to shift will never give you a real feeling for ssing, you'll be surprised how much you can actually suffer when you have no choice. Also, like someone above said, go one gear easier than you think that you need. Some parts of the ride may seem more boring at first, but you'll adapt, and you'll be able to ride the harder stuff. Plus you'll get more tired than you think and you'llbe thankful for the easier gear choice. Once you learn how/when to suffer with one gear,and you get a bit strong and smoother (at least as a sser, you may be crazy strong and smooth already) you'lllbe able to try a different gear combo, and you'll learn your limits and change the gear ratio to match the ride du jour