As with any mountain approach you must know the terrain and the approach. Ideally going into a mountain airport CAVU before hard IFR is a real advantage. I still carry WAC charts with me for all the mountain terrain so I can get a good feel for the terrain a lot further than 25 miles from the airport. On the 727 you had to always consider the possibility of loosing 2 engines and performing a one engine miss. Knowing which valley to go to as you are climbing at 200fpm is a real advantage. The same would apply to a light twin. Think outside the box. We used to fly into Puerto Vallarta a lot with the Lears. At night it was so dark you couldn't see a thing. It is surrounded by 11,000 to 12,000 foot mountains, but they are more than 25 miles from the airport. When you went in there at night it was real dark so you couldn't see the mountains. One of our kid captains from the west coast of Florida went in there one night. The next day I say him and asked him what he thought of the mountains as he hadn't been there before-he said"What mountains." This business will kill you with that attitude. Back to Aspen. Slow it down, configure early have the approach memorized then back your memory up with the brief and the plate. Have the missed approach down pat and know why the miss is the way it is. Know the direction during the miss away from terrain in case you have a nav failure during the miss.(facilities will fail, especially in South and Central America)Next enjoy it. I love flying mountain IFR, I have done my share, but the secret is procedure, procedure, procedure. Aspen is a neat approach but the only time I went there I cheated, it was CAVU and 100 miles vis.