If people could dl videos or read about MT and become proficient in it, well, what's the use of schools/dojo/dojand/kwoons?
It is alright to use texts and videos to learn new technique but if you lack good basics, you'll find yourself hurting yourself more than your opponent. Now what I mean by basics? Well, if you have good judo basics you may aqcuire some BJJ techniques to improve your arsenal. Now if you have say, Karate techniques and try to aqcuire some Aikido techniques without knowing any Aikido basics, you'll probably be standing there and thinking "WTF? Why isn't it working"?
The thing is, if you don't have any or little experience in martial arts, resort to a qualified instructor. And by basics I don't mean yellow to green belt in any style, I mean you at least need a black belt [1st Dan] or something equallent. Remember, 1st dan means that you have mastered the basics.
To aqcuire different techniques you need some similarities in your basic art and the aqcuired techniques. This means that it is easy to transfer techniques between say, Judo and BJJ cuz of their similarities. Same things goes with Karate and TKD, Boxing and MT, Gung-Fu and various arts such as Hapkido, and KM is able to incorporate all techniques possible, I believe. I don't want to go into the details, or I'll be rambling until tomorrow, but by now I think you may understand what I'm trying to say.
The first step I advice you is to find a qualified instructor in some trustworthy style, no "black belt in his own style" type of teacher. Second, train hard and focus. Thirdly, don't forget to aqcuire goals, such as "what suits me the most? What areas am I strong in?"
I hope I was helpfull
ps. . My first post on the TKD topic, so a big HI! to all TKD men and women out there!