Disk partitioning for 12.04 install

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http://askubuntu.com – I've 6 partitions with grub from an existing Linux OS on /dev/sda8. I want to install 12.04 on /dev/sda1 but since this partition has 31G allocated i want to resize it to 10G and create 2 more partitions from the remaining space. I want to know if by doing this will all my existing partitions get shifted and thereby i might have to reinstall them again or is it just a matter of reinstalling the grub on one of them (say Ubuntu) and add the remaining ones? Thanks in advance. (HowTos)