It took me a while to get a BobCat down to my place to build a berm. Truthfully, prepare to bring a large front end loader out to get it much higher than 7-8 feet. BobCat just isn't big enough...
What you can do as a temporary measure is get several medium size cardboard boxes, roughly 24x18x18 give or take, fill them with dirt and stack em up. Use T-posts to reinforce the stack from behind. Once you get it about 5 feet high and how ever wide, it works great for rimfires and handguns. Don't blast it with .44 mags, but it will stop 9mm, .45 ACP, .38 spl and the like.
Could be a quick way to get shooting on your land untill you get some earth moving equipment out there.