Yes that is a big MUST. Always press done, but if the texture pack is laggy, try changing your settings or even better, getting Optifine. Render distance is a key and many details and your Quality optifine.net
Sphax seems to be lagging for me too but I don't normally use that one, anyway goodluck!
Well where is your skin? I make loads of skins but I normally keep them to myself. For your youtube channel, you have to remember you need to give them credit if it's on your channel header, picture?
