NeWbie question

Hi, i'm new to bassguitar
(been playin guitar for a few years now, including 7-string) and i picked up bass a year ago.

on to the real question:
I need the tone of a low B string to catch up with my 7 string.
And i don't need the high G...

I bought myself a package of strings including a low B.

How do i put on these strings (BEad) without killing my bass...

(what do i need to change etc.?)

thanks in advance


(p.s i'm sorry if my english is crappy, i'm from holland y'know)