Dual boot Fedora KDE Spin and Fedora Workstation

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I am currently running Fedora 21 KDE Spin. I will like to make it dual boot with Fedora 21 Workstation. Is it doable? How? Please provide step-by-step instructions. I am a newbie!

df -h produces:

Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/fedora-root   50G   12G   35G  26% /
devtmpfs                 791M     0  791M   0% /dev
tmpfs                    802M   76K  802M   1% /dev/shm
tmpfs                    802M  904K  802M   1% /run
tmpfs                    802M     0  802M   0% /sys/fs/cgroup
tmpfs                    802M  1.9M  801M   1% /tmp
/dev/sda1                477M  156M  292M  35% /boot
/dev/mapper/fedora-home  406G  166G  219G  44% /home
tmpfs                    161M   12K  161M   1% /run/user/1000

What I will really like to do is to reduce the size of / partition to 25 gb and use the freed up space for installing the workstation.

gparted shows /dev/sda1 ext4 /boot and /dev/sda2 lvm2 pv fedora.