I find it hardest to limit myself in preparing a campaign. I get so wrapped up in searching online for ideas for tables for different situations and ideas for maps and encounters and adventures and general and specific world building, that I don’t get the smallest part done, a prepared adventure/dungeon/sandbox for the players to get started.

The advent of the internet and access to world wide RPG players and there ideas is a gold mine of ideas. There are just too many ideas to choose just one.

A GM must force themselves to focus and limit their development of the game to what is most needed by the players. If the adventures and monsters are planned and prepared for the area the players are in currently, then expand and add all the bells and whistles.

Time for preparation is limited, so one must limit their research and focus on the parts that require immediate attention for play.