Aubergines, or eggplant, as I know them are not hard to grow. They are a true warm season crop and don't sprout well in cold weather. They will germinate if soil temperatures are above 65 but 70 degrees F. is better.
They are shrubs and do well in pots. They are solanaceous like tomatoes and can be wind pollinated so pollinators are not required. They do like a lot of sun.
I am in zone 10, so I grow them outdoors for years. I have had them last over 5 years, but I usually replace them at 3 years because production declines. They are a shrub that gets four feet tall and nearly as wide. It is usually pruned back to make it bushier. They like to be in full sun.
In Northern climates, you may have a problem getting these tropical beauties to fruit unless you can keep them warm in a greenhouse.
I found a website about growing eggplant in temperate climates.
Happy gardening in Hawaii. Gardens are where people grow.