I'm completely linux newbie. I got a PC(32 bit) from my friend that has Fedora & Ubuntu on single HDD.Now I need to install Suse on the same HDD without destroying other distros.Please let me know what are the prerequisites for this? & how to do this step by step.

I'm not sure how the before installation is done?? I'm not sure about grub editing/tweaking.Plz guide me clearly.If you need any additional information plz let me know.At present installation of SUSE is very important

Ubuntu 10.04
Fedora 13
OpenSuse 11.3

Thanks in advance
Raju