I want to do SchH, and I've heard that the showlines don't have the desire to please as much as the working lines do, and I want that for training. I think that the Czech lines might be too drivey for a first time GSD owner, and I heard they also have a massive prey drive which would be problematic, considering I have Ozzy. I think a working line would be better suited for my first GSD and for Ozzy. Plus I prefer the traditional black/tan over sables, but that's the least of my worries.
^^^ Much of this isn't true, actually. It's not in "desire to please" where showlines can fall short in activities like SchH. With many there is little difference there, with some there is great difference there, but there are also lines of WL that certainly wouldn't be considered "willing to please". The big difference between show and working when it comes to things like SchH is in the ability to cope with stress, manage stress, and work through stress. But that's not the only difference, nor is it always a difference, as not all dogs fit these generalizations.
As far as Czech dogs being higher drive, again not really true. Some Czech lines have higher drive, but many are more moderate in drive. The highest drive of all, in general, would be the West German lines. To write off Czech lines as being too high drive would be a mistake, and to choose WGR lines over Czech under the assumption that they would be lower drive is in most cases the opposite of reality.
Misconceptions like these, which aren't uncommon so you shouldn't feel silly, are one reason why the best course of action is to get out and meet different dogs of different types in order to really get a feel for them. When you see ones you like, or don't like, ask the pedigree and over time you will see trends of the same dogs or general lines appearing over and over again in dogs you like, or dogs you don't like, and that will provide some guidance on where to look. Names in a pedigree don't mean much, it's the traits those dogs bring to the table that matter. This is something that only interacting with the dogs can give you a good feel over. People can talk all day online about how Dog A brings traits X, Y and Z, but unless you know what X, Y and Z mean, what they really look like in a dog, what they translate to in terms of behavior and how to train and what that dog is like to live with, they are just words without much meaning. Or worse, slightly different meanings to different people.
As far as being able to tell a German showline pedigree from working line at quick glance, sure kennel names can answer that but it takes a while to learn them and there are so many that a comprehensive list would be impossible. But looking at photos and titles is an easy answer. If the pedigree is full of black and red dogs with V and VA all in front of their name, it's show lines. If it's full of dogs of all colors, with few if any V or VAs, then it's working lines.