Pictures would be amazingly helpful.
Avoid using a chainsaw from the lift unless it is a top-handle or smaller saw than you list in your goodies. At least use it as little as possible. A sharp handsaw would reduce your risk substantially.
Scissor lifts are only for hard, flat surfaces.
What is the access and ground conditions where you will want to position the lift. Has there been any ground disturbance near the outriggers. If it is right near a foundation that you will be using a machine or outrigger of the machine, be aware than that soil may be less solid than other undisturbed areas. You need a hard/ compact area that is relatively level.
If you catch any limbs that you cut, you are most likely dynamically loading the lift. Not good. Much safer to rig them with quality rope that can stand up to the abrasion, and has the right strength, or cut pieces very small to reduce your loading.
More information and pictures would help to get you the best advice.
I suggest that you not undertake this job yet.
Im deffinitaly not talking about a sissor lift? A boom lift, tophandle, full harness, some rope for rigging if needed.