I use a Tamiya sprue cutter. When I cut very delicate parts, I do it like Bill does. Cut the tree where the part is connected then work from there carefully.
As far as the kit is concerned, I have built the same kit and I sympathize with you.
The parts for the bustle rack are a bit thin and brittle. And there were fit problems too (some are too short) that require some modification work to correct. If I remember it correctly, I think there is a gap underneath the turret at the root of the gun that need some filling up and sanding, too. And not to mention the injection marks on the individual track links.
There...have I discouraged you already? Lol. Seriously though once you get through those problems it turns out quite well. The details are very good, the basic interiors and the figures
are a nice addition, too. My finished one is in this link:
http://www.geocities.com/ddta_ala/m1a1ha.htm