Can’t Deal with CSS

i can deal with PHP and MySql, HTML and XHTML
but why i can’t deal with CSS?
hahhaa πŸ˜€

for me, CSS is pretty hard
imagine, we try to design a web page not with pencil or other writing tools but with a line of text -,-”
it is the first problem for me

The second is, i’m not smart in interface design, LOL πŸ˜›

want it or not, i have to learn it

what happen if i build a great web based system but the interface is very ugly
my client won’t use it,