Don't be worried about the gap you really only need to worry about that when bulk aging for months
As for degassing they tell you to do it with a spoon several times a day for 4 days etc as most people don't own a drill degassing tool.
With the drill tool you dont have to degas for days just degas once and when your happy that it's thoroughly degassed then stop.
Vacuum degassing is far quicker and far better.
As you already own a glass carboy I will highly recommended purchasing either a vacuvin wine saver tool to vacuum degas your wine.
Or even better a brake bleeding tool
Something to look into id recommend watching some youtube videos if your interested