resizing partitions with gparted

When I installed linux, there was a program that ran during installation which allowed me to allocate space from my hard disk to create a new partition. I think this was the GNOME Partition Editor; gparted.

Essentially it resized the (one and only) partition on the disk (which happened to be NTFS), it moved files around to create a continuous free space for the creation of a new partition.

I want now to resize my partitions again using the same program, that is, gparted.

If I run this program normally from linux, I can't resize any partition; the resize buttons are disabled. What can I do about this? I've thought of the following:

• Unmount all paritions first. This might enable resizing them, but could be dangerous, I don't want to try it without knowing the consequences first.
• Run gparted from a live CD. This is the obvious solution, but a bit of a hassle, and you'd think there could be a better way.

What should I do?

run gparted from a live CD. it's not that much of a hassle, and it works with NTFS.

you shouldn't resize partitions on-the-fly from the running OS, even when unmounted, it's just asking for trouble

Running from the LiveCD is the best bet.

One of the problems I used to run into was the swap partition. Since you have Linux installed, it should have a swap partition that the LiveCD will start using as well. Make sure to right click and select 'Swapoff' on the swap partition, this will allow you to manipulate all of the drives partitions