</font><font color="blue" class="small">( My hunting camp is rather low budget, may not be able to afford FEL. If we do not have FEL to help push the brush over ahead of the tractor, is there a recommended blade to mount on the front end to achieve the same results. )</font>
I run a 5 foot Woods BB60 cutter on a NH TC33D tractor (about 27 HP at the PTO) and it works just fine. I've cut down some 3" white pine with it without much trouble, just have to take it slow. I regularly do multiple 1 and 2" saplings with no problems, I just slow down a bit if it starts to bog down. If you get to 30 or 35 HP at the PTO, you're in the range where many people are considering moving up to a 6 foot cutter (30 is probably pushing your luck for heavy cutting).
I generally try to drive forward over the brush, using the loader to push it down, as someone else has already described. But I have also backed into a lot of stuff. If you are going to try much of the backing into it, I'd look at a hydraulic top-link. This lets you tilt the mower up as you back in, then lower it down onto the brush. This is the set-up I have, and it has let me get into stuff I couldn't have done otherwise. A word of caution: you want to make sure no one is anywhere near if you are running a brush cutter raised up in the air like this. As an added bonus, the hydraulic rear remote you have installed to run the toplink can also be used to power other hydraulic implements (such as a log splitter). Something to think about if a loader is out of your price range (though I'm sure you'd find LOTS of use for the loader).
John Mc