My advice is to go to Dishpointer.com and lookup your angles, set the elevation on the dish first then move dish to where it should be pointed, if your using a 1000.2 dish which I suspect you are then try to get the strongest signal you can on 119 sat, which would be the middle lnb cover the other lnb's with tin foil if you have to, once you have strong signal on that satellite, then tighten everything up remove foil & run a checkswitch, if all is okay then check your signal on the other sats 110 & 129
if it's weak below 42 then adjust the skew of the dish to see if signal improves if not then you may need to adjust the elevation slightly, best to use a Sharpie marker pen and mark where your current elevation is set on dish, so you can get it back if all fails. 129 is pretty much required as most HD is on that satellite for us in the west.
Hope this helps, it's all about trial and error, you can get away with a lower signal but you'll get rain fade signal loss, during the rain and snow.