The reason why you put the left over the right is that the gi is inspired by the kimono and when a kimono was the dress of the dead person for their funeral, they'd put it right over left.
The most frustrating thing about martial arts gear is in the sizing especially if you're a big strong guy because they're all made for slender Asian frames. I'm 6ft tall 300lb with a 50" waist and only a couple products fit me but none of them wrap properly except ones I had to tailor down in height. All they do is up size the entire product... they don't make it for bigger stronger people so if I get a gi that fits me I have to tailor it down from the seven-foot-tall cut they deliver to your door because the ridiculous manufacturers just assume the same frame at the same standard dimensions rather than keeping it of average height/length and just making it bigger to accommodate a larger more powerful individual. When I was 350lbs I only had two gis that would fit and they were hard to find and exorbitantly expensive for what they were...Fuji 10 and MACS 12 (these were the largest commercial Gis available but of course they were cut for people who were 10 ft tall so they are comically long!
Oh dear. How to put pant's on. Common Sense is how to put the pant's and the jacket on. The belt i understand, but there's a reason your about the only guy that's bothered to tell people something that if they can't work out after 15 min's on there own. Then i don't know what to say....