To get that meat out (something that does look like it could be a lot of hassle) you should stick your knife in right at the cross in the middle of his head and cut down towards the front of the head. Then turn the lobster around on the chopping board and chop down in the opposite direction towards the tail. It should look something like the above but dont worry if it looks really green, that just means its not fully cooked - fry it up in a some butter until all the green turns pink. There is quite a bit of meat in the big claws too (dont worry too much about those small ones.
You could also put this into a nice creamy winey mushroom sauce and return to the shells as we did or just eat it from the pot dipping it into melted butter as you go.
For a bloody scary looking (and sounding) creature these were fantastic, well worth a try.