I broke my leg up in Pittsburg, NH back in July of '03 and ended up with a blood clot that my Orthopaedic doctor misdiagnosed which could have killed me. Luckily death wasn't in the cards for me quite yet, but once they discovered the clots, I was on coumadin from 12/03 until just this past June '05 I finally was able to get off it. There was a chance that I needed to stay on them for life as well, but thankfully I was able to ditch them.
I hiked throughout the entire 2004 summer on coumadin doing Washington, Moosilaukee, Welch/Dickey, Tecumseh, and Monroe/Franklin Eisenhower. I basically just played it extra careful on the trails, but I didn't pack anything special. I know I probably should have. But yeah, you really gotta be careful as even small cuts can be hard to stop bleeding. I stayed away from any bushwacking, that was for damn sure.
I bruised real easy throughout that time so you don't even want to fall or bump into anything while on that stuff. Internal bleeding can happen from small stuff like that so that can be a little scary. They tell you to wear a bracelet type thing or something to that effect which instantly signals you are on coumadin in cases of an accident/emergency if you were ever out of it so at least people trying to help you would be aware that you need special, quicker attention or you could bleed to death real quick.
In truth, last summer I really put all that bad stuff out of my head and just hiked like I normally hiked, albeit a bit more careful and aware of my footing. I'm sorry to hear you are on it for life. I seriously hated being on it moreso just for the fact I couldn't drink alcohol anymore and more importantly, anytime you need to go on a medication for even the flu or whatever, you'd have to get your blood levels checked and back in line constantly. That was a HUGE pain in the rear. You get used to needles getting stuck in you real quick (which I originally HATED.) I tried not to let it get me down though. My doctor also kept telling me to hit the trails and go hiking as the more excersize you get, the better for the blood flow. In my case, I think that summer of hiking actually helped break down the clots I had. It is a tough thing to deal with though so good luck to ya.