I've just started F1, and having little problem easing into the cycle. Before I was doing a lot of strength conditioning and mobility work for trapeze. It's challenging me, but not yet pushing me to limits.
I do a lot of international travel, so this will be a recurring issue for me. Upcoming is a 10 day trip to japan that is one week after my scheduled deload week. Given that my body is still feeling pretty comfortable with the level of effort, I'm considering repeating the last week of the block twice and taking the deload week while on the road.
I guess the other option is taking two deload weeks, but I just don't think that's necessary. My least favorite scenario is attempting mastery on the road, or starting harder blocks.
(I tried to search for this, I'm sure it's been answered but 'postpone deload' and 'extend deload' came up with nothing. There is a lot of information in the forums, but it can be hard to find. There are a lot of posts!)
-David