Yeah cornering is a good method.. but what I prefer is to just use the cheap-o lighters and adjust the flame to be as small as possible to only light small sections of the bowl at a time. BICS are good, reliable lighters but they have huge flames that will usually always end up burning more bud than you want it to.

Whenever the bowl is cherried and smoke is seeping out of the top, a lot more bud is being wasted than people probably think. Notice how thick that smoke is. Usually a small /decent sized hit each time, so when this is avoided you can easily squeeze in a few more overall hits. Dont believe me? Have someone torch the bowl when they take a hit, and put your mouth over the bowl at the same time and see how much smoke you can get and you will understand why the goal is to avoid letting that smoke going to waste.