It's hard to get help alot of times on forums with just reading and posting posts that may not get answered. I found this guys youtube channel and he is awesome! He does videos and tutorials and even has his own website. This root for your myTouch 4G is fast, easy and already is overclocked! Check it out!
http://www.youtube.com/watch?v=43L4MjYk2MQ
http://www.youtube.com/watch?v=43L4MjYk2MQ