spending your whole life with yoga practices and living in solitude of nature
This works but its very sudden and you may not be ready for what you find or understand what you find. I suggest the yogic meditations. Its not easier, but you won't experience a plate-tectonic shift in your personality and knowledge, you'll experience a gradual awakening.
Just be careful not to open that 7th gate. When you do there's no turning back
dont listen to people saying its hard, its not. And nothing huge will happen either. At least, most likely it wont. Your third eye opens on its own all the time, mostly when receiving information that will greatly help your life, but it you wish to open it own your own simply focus on a ball of purple/blue light in the back of your brow. Spin it and imagine an eye opening. You should feel some strange pressure there.
Congratulations, you have opened your third eye.