Welcome to DV! Don't worry, your English is fine.

To your questions: It's ok if your mind wanders. It doesn't affect the effectiveness of MILD.

The fears you have related to WILD have to do when you're in sleep paralysis (SP). Don't worry, you don't have to experience SP to WILD. Even if you experience SP, you might not experience hallucinations.

Feel free to ask any questions you might have!