Thanks for the question. I started with DIY meditation. I got a couple of books, mainly the techniques were repeating some phrase, focusing on the breath etc. This was okay for me to start. But I have been working with a teacher for about 12 years, which really helped. There are lots of different types of meditation, some with religious or spiritual undertones and others that are completely outside all that. Find a style that you vibe with based on what you think/believe and run with that.

By "years of sincere effort" I mean practicing daily. 20-30 mins is probably enough to start. I would compare it to playing an instrument. Daily practice is pretty essential.