Wing Chun Geeks blog. While it was written specifically for Wing Chun students, I think it applies equally to learning any martial art; indeed learning about anything worth learning.
Below is an excerpt. The full article may be read here.
Mistake #1: People want to learn too fast
Gong Fu means hard work, and Wing Chun
(sometimes spelt as Ving Tsun) is a style of Gong Fu. This means you
have to put in a lot of hard work before you can move onto the next
level. Do not be in a rush to learn all the forms, do not be in a rush
to get to Chi Sau. Your Sifu will direct you there in good time, if you
rush him or her, it will show in the quality of your Wing Chun.
Mistake #2: People try and change or add to the style:
Wing Chun is a very individual style,
meaning my Wing Chun is going to be different than your Wing Chun.
However, this doesn’t mean you can start changing the style to suit your
needs. For example, if I add flying side kicks into the style, it
would totally change how the style works. If you are adding things that
might not belong there, more than likely it means you are on a low level
and do not fully understand the style.
Mistake #3: You never hit anything
We are not suggesting you go around and
start beating up people at the local bar. We are suggesting that you
start to practice HITTING THINGS. For example, the heavy bag, a wall
bag, wooden dummy. It doesn’t matter what you hit, as long as you mange
to fit in some kind of resistance training into your regiment.
Mistake #4: You do not want to get hit
Getting hit is not a bad thing (as long
as you do not lose any teeth.) What we mean by this is if you Chi Sau
or are training with a partner and get hit a few times, it is not the
end of the world. This just means they have exposed your weakness and it
is your job to correct it. Use “getting hit” as an opportunity to
improve your Wing Chun.
Mistake #5: You do not focus on your stance (also known as horse)
Mistake #6: You only fight Wing Chun people
Mistake #7: You think Wing CHun is the BEST style in the world.