@johnsetterlund You'll find you have an immense amount of space for Linux, once you remove that virulent Redmond malware... :-)
Alternatively, you could do something like this, if you like:
Dual-boot [personally i'd advise against that, in favour of the following]
Backup all your data [duh]
Ensure you still have your Windows dvd & PK
Having previously decided your fav Linux distro [obviously that's a lovely enjoyable "problem" to have, but eventually from testing via LiveUSBs or otherwise VMs in your current Windows, you'll have a target selected], install it to your SSD by reformatting SSD & partitioning with [eg] /dev/sda1 = 30 GB / [ie, root; can be smaller but this size is for future-proofing], /dev/sda2 = Swap [= to your RAM, albeit there's LOTS of valid alternatives here; for illustration here i'll assume 8 GB], ~6 GB unformatted at the very end of the SSD [="over-provisioning", for SSD internal block housekeeping], & the remainder being /dev/sda3 ~76 GB for /home.
Within /home create a VirtualBox VM of ~35-40 GB [or smaller; basically sufficient for Win itself & whatever must-have pgms you want therein; no substantive data storage needed herein], & use VB's Shared Folders feature to access whatever docs you wish, from your /home partition.
Coz your SSD only has 120 GB, whichever distro you choose probably need a filesystem of ext4, xfs etc for root but NOT btrfs [that needs to be quite larger than 30 GB if Snapper & Rollbacks are wanted].
Also if you'd like to use a GPT rather than BIOS partition table you'll need a tiny fat16 initial partition of say 180 MB [probably can be smaller] mounted as /boot/efi & with boot + esp flags.
Over time, as your familiarity with Linux increases & your regard for Windows shrinks, you'd actually be able to adjust the Linux / Windows space allocation balance... sooner or later you'll realise that there's ever-decreasing need [& desire] to launch the Win VM coz for all the pgms you need you'll have found good Linux replacements, hence one by one you can remove those from the VM, & shrink the VM down, giving you more storage space in /home.
There's MANY good variants on that plan available, but that's just an idea for you to consider if you like.
