Sadly, despite following Hamilton Accies for about 45 years, I've never seen my team play in a semi final or final at Hampden so I don't know what [small section of a particular] end we would get.
It would make sense to give us the Celtic end (even if we were playing Celtic). I once went to a semi final Motherwell played against Celtic and Motherwell got the Celtic end and Celtic got the Rangers end. The next time however this was reversed.
I did once get to see Accies in a semi final (1979 league cup semi final) but it was at East end Park and we got the Falkirk end.