Oops, I mixed them all up. I meant that you need to have a steady hand for Lasso tool, sorry.
So, that changes a lot from what I said before. I don't use Lasso tool, I meant Polygonal and Magnetic Lasso tool.
5tag - And about Lasso tool - that is the point, it won't be able to select all parts properly. First I take Magnetic Lasso tool and use 2-3 seconds to select quickly around the car (for ex.) so that it would select at least most of it. Then I use Polygonal tool just to fix the places it selected badly. This way you save some time, you don't have to go and select the whole object by Polygonal tool, especially if it is not a small object (for ex. car), but if it is a small object, then again there is no point wasting time with Magnetic Lasso tool.
P.S. I fixed my previous posts, so people wouldn't get confused if the information is useful for anyone.