I am currently playing D&D fifth edition with a GM I have never played with before. He will be giving out XP in milestones, so that we will be given XP when we do something specific or reach a certain point in the story.
I have played in a few games before but none so far have used this mechanic. It seems a little strange to me, and it seems like even going from level 1 to level 2 might take considerable time.
What is it like to play in a game like this? Can you give me insight into what might be in store for me, as a player, as the game progresses?