Hello Robert,
I looked at the guide, and from the steps and tools used, it should be hard to rip the ribbon cable if the battery is pried in the correct locations. However, anything can happen when performing a repair, and in this case, the part you broke is very inexpensive. At this point, if you are feeling confident, then I would just get a new cable and install it, job done. However, if you don't want to go through that process and risk damaging anything else, I am sure a local repair shop could help you with solving the problem. If I was close to you, I'd even help you fix it, but I don't believe I am in the same country. If you do want to get the part, you can find it here.
[product|IF124-012]
The easiest thing to break when installing it is actually the cable itself, so again, I would be careful. If you want any more advice, or have more questions about installing the part, feel free to reply. Hopefully you can get your phone sorted out soon.
Hope this answer helps!