2-Din TV/Head unit in VR

[tysons_2001]

I am wanting to purchase a 2-Din head unit off ebay for my VR. I am just wondering how hard it will be for me to install. ive put in single din units before and was quite easy but never a double-din unit.
i am looking for a cheap unit with touchscreen with tv tuner like this one:
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&category=14946&item=5789784856&rd=1
Please let me know your opinions.