Got a helpdesk interview on Monday for a store called Paragon Sports, but im nervous

why? I don't have much experience in what they're asking for.
Here is the listing
We are looking to fill a Part time helpdesk technician position. Must have knowledge of all windows operating systems and office products.
Some responsibilities include troubleshooting hardware/software issues, fixing fax machines, copiers and asset management.
Must be able to work weekends and until 8pm.
This is an entry level position.
I'm not that great with microsoft office. I know my way around word and powerpoint, but excel, outlook, access, groove etc i'm not too familiar with. Neither am i familiar with fixing fax machines and copiers.
I went back to my A+ book to refresh myself on printer technologies and i'm reading this office for dummies book.
Any pointers? Thanks