For me, each build has been a learning experience. I've gotten quite a store of experience, tools, techniques and habits but with each new model, while those come into play (usually), I am always confronted with new things to learn. I've used for rigging: monofilament of various sizes and stiffness, stiff wire, stretched sprue, EZ Line in large and small sizes and a kind of stretch thread (not so hot). I've made turnbuckles from various types of tubing, settling finally on brass, and depending on the material I use for the rigging "wire" will do the loop-back method through a wire eye and tube, or maybe wrap the material and paint it later as a fine Japanese modeler does, or slide on a tube or two, attach the wire (this works best for me with EZ Line) to the mounting points, slide the tubes to the correct positon and lock with CA. Sometimes I just don't bother with turnbuckles, depending on how I'm feeling at the time. I no longer beat myself up for not making "accurate" turnbuckles and applying them at every opportunity. Sometimes I do. I'm working on this...
I would venture to suggest patience, a rigging line cut three times longer than you believe necessary (it's cheap, after all) to make handling it easier, magnifiers – I use an Optivisor – and soothing background music. I also find that various brands of Scottish modeling fortification elixir is sometimes called for.
Your Pup's looking fine. Don't be too hard on yourself.
Regards,
Eindecker