Giant bass are top predators where they live and tend to repeat feeding habits and locations seasonally. Like must predators they are dominate where I fish, unless the lake is shared with striped bass. Casitas doesn't have stripers, Castaic now has stripers, but not when I was catching giants there. This is important because you need to know what fish is dominate, allowing the bass to go where ever it wants to go. With practice you can look at a good topo map and have a good idea where pre spawner's and spawner's will be located based on the type of lake and prey available. To answer your question, I always approach a spot thinking there is big bass in the area. This means you do not want to alert the fish to your presence or spook them, they can be very wary, a learned response is they stop feeding and move into deeper water. Slow down a approach with stealth, like you are stocking a trophy animal, because you are!
I try to visualize the bass looking for prey, then present my lure to mimic that prey anticipating the strike. If anything feels odd, I crank the reel a few turns quickly and set the hook if there is any resistance. This is my normal approach to high % locations, I only meter the area with sonar after I have fished the spot to determine if any bass are there or suspended nearby. If I meter bass, then I return anywhere from a few minutes or hours depending on what I metered. I usually have a milk run of known spots and fish each one with the same approach, if knowone is fishing the spot.
Keep in mind these lakes are small and high pressured by knowledgable bass anglers, often a few pros. There are very few secrets today, so you just blank out the other boats and keep focused. Bad weather is your freind during pre spawn, it keeps a lot of anglers off the water and quites down the ecosystem. Fewer boats increases your odds and the bass tend to stay active for longer time periods.
Every giant bass that I have caught wasn't a loner, it was feeding with other big bass, unlike the popular thinking big bas are loners. If you catch a big bass, keep fishing!
Tom