It is very easy to use once you get the hang of it. I have the same machine, there should be a yellow handle that controls the up/down and also the blade engagement lever. Bring the blade down, and as soon as you get close to the ground, flip the yellow lever up and the blade will vibrate, bring the blade into the ground until you can barely see any blade and off you go.
Pulling machines are as easy as that. I would highly suggest you rent one for a day, although it might be a little spendy it saves A LOT of time!
Thanks,
Alex