Yes, because you will need to include() the pear modules in PHP files that need them.
If you haven't already, you should create a local development station mirroring your hosting company as close as possible.
Apache 2
mySQL
PHP 4/5 with PEAR
phpMyAdmin
Be patient with it because if you are doing this for the first time, it will be aggravating as hell. My suggestion is to first start out installing Apache 2.x and getting it to work. Then tackle installing PHP and getting PHP pages to show up. Then install PEAR and run some PEAR applications.
After that, install mySQL. Then phpMyAdmin when you are ready to do some database work.
Give yourself anywhere from 2-5 days. Take notes on how you are installing it because no doubt you will need them again.
Good luck!