If the yearly subscription was mostly personal use, and a little for my job, can I deduct them at all?
Yes, you would just list those under Business Expenses.
You do not have to have the home office deduction to deduct software subscriptions or other expenses such as postage, office supplies, phone expenses, advertising, etc.
If I used them solely for business related things, I can deduct the full cost?
Yes, if it was used exclusively for business, then you can deduct the full cost.
Which category would software subscriptions go under? Supplies, miscellaneous, or something else?