I really wish people would stop doing this sort of thing, there are really no excuses for it these days. Even with a cable release or infra red remote, what is there to stop a big carp flapping off the mat and knocking itself to bits on the gravel, while you're faffing around with a camera on your own?
Self timers are a complete waste of time imho, as Dave's 'juggling shot' clearly shows and you really shouldn't be standing up holding a fish of any size of any species. If you drop one from any sort of height, this may kill it!
Get yourself a few contacts who you trust with a camera. With most people having moblie phones these days, someone will usually come and take some photos, if it's a special fish to you. Otherwise, just lay it on your mat, and photo it against something for scale (see my Avatar for example), or just put it back. You can always try and catch it again and 'Trophy Shots' are really just an ego thing imho.
Cheers, Jack