The best advice I can give a new gun builder, engraving their first gun is, avoid long straight non-flared cuts like the plague. They are incredibly hard for a seasoned professional to pull off successfully. Learn to tilt your graver to get a nice even flare, and yes we all find it easier to flair one direction than the other, it takes practice. Short stop cuts, crosshatch shading, and even wriggle work, can take a basic pattern to the next level, so make some practice pieces using these techniques. These fill in techniques make a relatively simple design appear more complicated. Train your eye to disassembly engraved work, to calculate the steps required to duplicate it. Good luck.
Hungry Horse