How do you get past the pops and hiss of LPs?

I have recently got out my dad's old Thorens TT (TD 150 MKII) and listened to some of his old classical LP's. I think that it is a warmer sound than CD but I can't get passed all the noise. I asked my Dad and he said it always sounded that way. Am I doing something wrong? Do you just ignore the hiss and pops? Thanks in advance.

-Kevin