Hey Crowe lemme tell you something: Gussets SUCK! Haha! There are a lot of different techniques, they all have their pluses and minuses, tradeoffs if you get me. Being an experienced leather crafter is knowing when to use each technique to maximize a benefit, and limit a liability, but end of day, gussets are a pain in the butt, no way around it. What ever you do, I'd suggest cut the gussets larger, score the flesh side where they should line up, and work to that position, but understand that when the rubber hits the road, or the leather hits contact cement, things are going to get a little squirrely, and you'll likely have to adjust.
Sorry I don't have the time, or the depth of experience to explain each technique, but I'd do as Stetson told you, find some printed resources and study them, try test projects, away from actual finished pieces, so you can gain some experience on the little details that make all the difference. Also, there are seemingly endless ways to skin a cat (or a cow for that matter), no single resource will contain every technique, so just keep learning. Leather work is very simple and very complex, you can have five tools that do the same thing, but are slightly better at an aspect of that thing so find use in particular cases, and you'll have one tool that will be used in five completely different applications! It is madness in the leatherworld, I'm finding.
I really wish there was a solid, structured, and free leatherworking class/series on YouTube. But I haven't found it, but I have learned a lot from tutorials, but also promotional brand videos you can catch little details, little tricks and hacks that a particular house/shop has employed to solve little issues. For example, was just watching a promo video for a high end bag maker, and noticed in the back of this shot, the walking foot of the sewing machine had a fine calf wrap to diminish the footprint on softer leathers. I've never seen anyone talk about that as a solution, but just caught it in the background. As I learn more, tutorials and other leather based vids on youtube will open up, I'll catch more details because I've confronted similar issues. I've watch certain videos literally 10+ times over a year, and learned new things from each watching, catching things that I missed because I hadn't experienced a particular issue.
And one more time, don't neglect those print resources. Some things have changed totally in the leather world, like cnc robo leather cutters, but in many ways, tools that were made and designed 200 years ago are the most elegant and perfect solution to achieving an effect in leather, so the printed material about those tools and the application of those tools to leather work is still very much relevant.
Sorry couldn't be more helpful, but I'm literally speed typing and I'm searching for info on a problem I'm facing!
And don't forget, gussets suck!