Help with skinning

[ckyfan2k]

hello guys i was skinning stuff and when i use the lasso tool my hand will shake and i wont get the dotted line right on the borders. is there a way to make the line straight or do the people who make the tutorials have a really steady hand? if there is a way to make straight lines i could deffinetly make some sick skins. THANKS!!

EDIT: o never mind i found the polygolnal lasso thingy it works great!!