Request - Advice for mending a large ruck

I recently acquired a ruck with a few holes and I’m looking to mend them. I found some basic instructions on hand sewing a bar tack to repair it, but I just want a reality check on how doable it is and any tips. If I really can’t do it, there are several local places I think can do the repair, but I’m a big believer in fixing my stuff, and I’ve got another pack that looks to be in need of a quick sew job as well. I’d describe my sewing skills as good at buttons, decent at straight stitches.

Note: I have the “right” thread on the way.