W211 - Replace Stock Bulbs to Xenons help

Hi all

After my recent outing on here, the guys were really helpful so I thought it best to ask here...

I recently bought these Xenon bulbs from ebay:
http://www.ebay.co.uk/itm/3306785204...84.m1439.l2649

I am wanting to have all the lights as xenons if possible.

Can I install them myself? Is there anything extra that I need to buy extra? The Car hasn't had any changes to the lighting wiring - its all stock.

Car is W211 E270 Cdi...