Removing camshafts

[Allldi]

Hey fellas. I was participating in a Driver Education a few weeks ago and something broke in my motor. I took my valve cover off and I can see that I broke a valve spring. I broke the outer valve spring of the rear intake valve of cylinder 1. My next step is to remove the camshafts. Do I need the Porsche tools called "assembly bridges" in the manual or does anybody know of a good way of removing the camshafts without those tools? Also, when removing the chain tensioner, how should I compress the plunger? Any other information pertaining to removing the camshafts and the chain tensioner, or any other information pertaining to the head is welcome and appreciated. Thank you.