It depends on how well you can read English. If you follow the directions in the guide, it should only take 10-15 minutes, but people sometimes skip instructions, get stuck, get frustrated, etc. Most of the 'difficulty' comes from the randomization the loader does to make sure everyone has a completely unique copy of everything—hence why we've never had any detections. I can say I have hundreds of Chinese customers whose first language is not English, and they seem to have no issues setting up the hack.
The actual usage of the hack is pretty straightforward and can be seen from my videos. If you are interested in macroing your rotation (using Speeder), that will require some setup on your part (examples are provided), or you can find premade macros for every class on Discord, though the authors will usually charge a small fee. I am always happy to help with macros for free, of course.