Lots of good advice in this thread.
One piece I didn't hear mentioned is the additional magnitude of risk that comes from venturing into the BC on a trip.
1. Lack of local knowledge. Even if you are knowledgeable about snow safety, not understanding the topography can get you killed. It can make you more rigid in your planning, because you know a specific drainage takes you where your exit is, but you don't know where other aspects take you. Or, you don't ski what you thought you were skiing. Or, you see some great line on your approach and decide to take it instead, not knowing that it changes aspect, or feeds a terrain trap, or cliffs out, or gets you somewhere you just didn't want to be.
You also lose your ability to keep track of what is happening in the snowpack over time. Having a few months is certainly better than a few days, but it feels like enough time to feel comfortable while still having vast gaps in one's knowledge, which is where many of the problem start- and incorrect understanding of risk.
2. The need to "make the day count." You have a line that makes you drool each time you lay eyes on it. You want on that line. But you don't have the luxury of biding your time until the line gets right, because you have to go hop on a plane in X days. You are testing your willpower each time you venture into the backcountry, which leads you to look for reasons to ski something instead of reasons to abort.