We lifted various parts of the frame using a home made sheerlegs (two actually, one made of wood, the other made from scaff tube). What I can recommend from this experience is Spirafix ground anchors. I have no link to the company other than being a very satisfied customer. You basically drive them in with a mallet (or screw them in in softer ground), attach a shackle and haul. They do a bracket which links two anchors together which can resist more significant side loads than a single anchor.
If I were starting the build again, I'd invest about 4 times as much in these things! In a forest, you can probably simply attach to the trees, but if there's not a convenient tree it takes less than 5 mins to get an anchor point.
To return more directly to your original question, our sheerlegs can be seen in action here:
http://dyiu.hoovesofdestiny.co.uk/2012/10/03/topping-out/ I used a simple lever winch to adjust the angle allowing a forward and back movement. Side to side adjustment involves moving the sheerlegs which is not so convenient. A gin pole requires more people to operate the side to side movement (You have to operate two ropes simultaneously as I understand it) I used a sheerlegs because for various parts of the build I was on my own.
