Ubuntu Studio disk installation and partitioning guidance

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http://www.ubuntux.org – Hello iv downloaded the Ubuntu Studio ISO and burned DVD-R and it is a success from what i can tell so far. I wan't to install this aside windows with a rather good size partition around 30-40G. The problem is i'm not very experienced with partitioning in general or the partitioning tools supplied by Ubuntu. I know how to resize partitions in Windows Vista like shrink partitions and rename/reformat unallocated partitions but i'm not sure how to do this in Ubuntu installation. (Distributions)