If it's Curbishley, yourself, you;ll have nothign to live for football wise. Even if you shot him you'd still know that your club wanted to sign Alan Curbishley as manager.
Sven, him, but only in the thigh to give him a warning to behave.
Koeman, him, in the head, to stop him **** it all up the moment he walks in.
Zola, above his head (not hard to do) to warn him off.
Houllier, anywhere near him, he'll have the second heart attack he needs to retire.
MacDonald, yourself probably as well, a swift Beretta blowjob.
Can't think of any others off the top of my head but I suspect whatever firearm you've gone for, you may need it.