Our shop just did a clutch on a 2008 G coupe and honestly, its not a job for a beginner. Not trying to insult your abilities or anything, but there's a reason it costs so much to do one at the dealership, its by no means a "throw it in" job. Ours was complicated even further by the fact that someone had already put a Spec stage 2 clutch/flywheel in at some point (car had 76K on it and had been through 2 clutches
) and hadn't done the greatest job on the installation. Missing bolts everywhere, not to mention the flywheel bolts for the spec setup are different than the factory ones, so we add to wait on those for an extra day. Its a big job even for a master tech with helpers, a 2 post lift and a trans jack, not the kind of thing you want to be doing by yourself in your garage (unless you have a really awesome garage...)
Also on your synchro concern, depending on how many miles your car has and how you drive, yes they might be starting to get a bit worn, however you wont be able to directly inspect them without ripping the trans apart. For a typical clutch job, this is not done, as the trans gets removed but left intact. You wont see the inside of it by just having it out of the vehicle. Not sure what you're getting at when you say you "think its more the synchros than the transmission or clutch", as the synchros are part of the transmission. I understand wanting to work on your own vehicle to gain experience and knowledge, but judging by your current level of expertise, I'd strongly recommend that you have you clutch done by a professional and maybe take the learning in baby steps.