When I get to worrying about things I can't do anything about, like falling off the ski lift when I took a ride on it in the summer, I use worst-case thoughts and go for it. I was terrified I was going to fall off and was pestering my husband, an engineer, about how "safe" was it (we're both grossly obese so the weight issue was worrying me too and he reassured me that people in winter outfits with skis weighed more than the two of us) and finally I realized it was sad to be spending the "trip" being terrified and miss the great scenery, etc. So I just "accepted" that the ski lift was going to fail and I was going to fall :-) and this was my last few moments, how did I want to spend them? It helped a bit to shift my mind from the fear to the scenery and "living" rather than fearing the bad thing.