Attaching External Antenna to Belkin F5D7130 Access Point?

Hi,

I've seen this at http://www.wimo.com/wlanrouter_e.htm

<snip>
So you want to connect an external antenna to your router, but this
does not have a removeable antenna? That's where we can help
(probably).
We can modify most routers. The existing, fixed antennas are removed
(one or two), instead of the antennas cable jacks are installed. Then
you can attach any antenna to these connectors. We will install RP-SMA
jacks, which are the most often used types for WiFi equipment
<snip>

How complicated is this operation for newbie in electronics?

Is this somehow possible to do also on the F5D7130?

(inside the F5D7130 pictures)
http://wireless.gumph.org/content/3/...des-02-big.jpg
http://kerozen.free.fr/topost/F5D7010_800x600.jpg

Thanks for help.