How could I make custom props?

I'm trying to get stuff together in preparation for a map I'm making, however the central theme is a dark, mushroom infested forest. Thing is, I can't seem to find any asset packs that contain large player sized mushrooms, and the swamp pack I tried only contains small brown mushrooms, so I was wondering if I could make custom props somehow, and how difficult it would be. What program would I need to accomplish this?

Simulacron said:

To make a model you can pretty much use any modelling software out there.
I would suggest blender. It's free and has all the tools you need.
When you finished your model just use this tutorial (https://tf2maps.net/threads/tutorial-blender-and-the-source-engine.28408/), which explains how you can port your model from blender to the source engine.

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Thanks! I've heard of Blender before, is it relatively east to use?