VDI Printing Locally

ESX 3.5 hosts. Guest VDIs running Windows XP Pro

Hi,

I have VDIs set up for my users.  Basically then need to print from their local fat-clients wether they are in the office or their houses.  So each person might have an individual printer that needs to be recognized.  I understand in RDP where the setting  are to use local printers but only my HP printers get installed on the VDI.  

I know there are products like UniPrint but I just need to know how to install a printer driver on their VDI for the time being for their home printers.  I tried just roaming to the inf file of the printer and choosing install while logged in as me, an admin on their machine.  But it doesn't seem to work.

So i'm wondering

1.  How do I install print drivers on the VDI so they can recognize the printers over RDP?
2.  Do the end users need access to the share where the print drivers are located or does install bring it locally?

Thanks

Dave