How hard is scripting on Lua ?

With my experience as a normal developer, switching to Lua was easy as hell to be honest.. But that is IF you already have development experience.

Some things in Lua can be unconventional or awkward, especially with gLua. The Lua in Garry's Mod differs from regular Lua in that it is technically "gLua", where several changes have been made and a lot of enhancements have been made to try to make it more of a modern language.

Your main hurdle with learning gLua will be that some things aren't super well documented, or some more advanced methods or ideas aren't overly public. Because of this, you have to learn a lot more through experience than you normally would. For example, if you encounter an error in Java or C#, you can almost always find a similar enough issue someone else has had. However, with gLua, I find often times the solution isn't available or the issue hasn't ever been publicly documented with a solution. The Garry's Mod forums used to have some help for these issues, which luckily was archived before it was shutdown.

Your best friend while coding will be the official wiki: https://wiki.facepunch.com/gmod/

Scripting in LUA is easy...... for some time, if you look around for some time it gets pretty hard and nasty. But there is a whole wiki that helps you every time and it is really good and detailed!

The wiki (https://wiki.facepunch.com/gmod/) is a good thing to use. I have seen some good youtube tutorials on the thread but I found using them alongside my own challenges worked best

It's not really hard, mainly depends on your programming knowledge.

It just depends how well you know the language. but lua is simple and really easy to learn

Well, it not that hard but watch videos and etc to learn everything you want to know about lua.

like others said its not too hard and there's plenty of tutorials out there

Lua Isnt too difficult, you just need dedication to learn it properly, I have never gotten very far in lua due to my lack of patience and dedication.

Lua is pretty simple and a great way to start. I'm currently learning it too.