I'm interested to hear what you mean. What games are you comparing it to? What do you find hard about it?

Hmm. When playing online, I feel like Pathfinder/DnD5e put a lot on the game master in terms of lots of prep, battle maps, tokens, etc. B/X etc can be played much more theater of mind, and so would seem to require less work. In person, probably less of a distinction.

Personally, I have tired of the modern 5e/Pathfinder type games where the play often revolves around combat that takes way too long, where playes don't interact much, spend their time waiting to roll the dice and gazing at their character sheets trying to find an answer rather than by interacting with the world.

OSR systems have a ton of already published modules and campaigns to draw from, if you want zero prep (beyond reading, and maybe drawing out maps or something). Otherwise, it's about the same as running any other system in my experience. Easier than some, harder than others. The Dolmenwood campaign provides a lot of information for the DM, too.