M20 Valve Stem Seals - Without removing the cylinder head

BMW M20 (M20B27 - not sure how you would fare with the dual springs) valve stem seals replacement guide, without removing the cylinder head. Many say it is impossible or not practical, but if you are like me already recently removed the cylinder head, why would you do it again? Anyways, just noticed there wasn't a real guide anywhere on the internet, so I created this, and you can see my whole process that I developed over time, hopefully learn from it, and be far more successful yourself.