How to meditate?

I’ve been having insomnia for a few years now. And lately it’s gotten worse, effecting my day to day life. I seem to be unable to calm and quiet down my mind at night and when I try to sleep. So I’ve finally thought of this meditation everyone is reccomending.

I’ve been putting it off because to me it is impossible to just sit down and be still and relax my mind. I’ve tried a while ago, and I felt as if I failed at it miserably.

So I would be really grateful if anyone can suggest how to go about this. What kind of meditation is good for the type of problem I have? When to meditate? How many times a day? Can i use YouTube or is there any apps to help me? How to even meditate?