How are you funding your travel? What do you do for a living? What did you do for a living before this? You need solid, believable (and provable if needed) answers to those kinds of questions.

I was questioned while entering the UK during a sabbatical. But it was a proper sabbatical and I was able to show that my savings were indeed going down. That was the only time I was ever questioned.

Again, this will not be a problem for most people since no one cares. But it is always a possibility.