n00b question about mysql backport

["JK" <jdkullmann@aliencamel.com>]

I'm a complete n00b regarding linux and installing so please pardon me 
if this is a dumb question.

I'm running Debian stable and mysql (4.x I believe).  My main user now 
requires mysql 5.x

I've used apt-get or aptitude for all my installs to try to keep my 
system in a somewhat sane manner and want to avoid manually installing 
things (I could manually download and install mysql 5.x but I just 
don't think everything would be right if I did that).

I only see mysql-server in the backports (e.g. no mysql-client).  So 
my two questions are:

1) is installing just that sufficient to bring mysql up to 5.x on my 
system?  Don't I need -client and libraries or other items too?
2) do I use apt-get to do the backport install and if not, does it do 
it in a manner such that the install/package or other tools on my 
system will be correctly aware of what I've installed?

Thanks for any help