IMHO I would say yes, for 2 reasons.
i. Loading caches into Cachemate without GSAK is possible but a real pain.
ii. Once you have a knowlege of GSAK, Cachemate is almost automatic.
I know GSAK can seem daunting at first and on your own can be rather like trying to learn how to ride a bike form a book of instructions. The easiest way is to spend an hou with someone who is familiar with it.
From the caches you have found, I am guessing that you are from the Blythe area. I offer the following suggestions:-.
Have a look for events in your area. I'm sure there will be several in the run up to Christmas and go to one, or more, of them. You will find a friendly bunch of people there. most of whom will be GSAK users and will be happy to help you.
If you haven't already found the NE forum try asking for GSAK help on there.
I would offer to help but I am rather a long way away in Northamptonshire!
great advice thank you so much.