locs can be as high-maintenance as other styles, depending on how manicured you want to keep them.
if you are a product minimalist, and you don't mind a little natural fuzziness, they can be low-maintenance and fun.
i don't have locs, but i have family and friends who do, and i've been chemical-free most of my life, so i'm confident in the advice that i'm giving you.
1. you can start your locs and maintain them by yourself. you can start them with 2-strand twists, palm-rolled coils, braids, or freeform from an afro. however you choose to start them, make sure the base of the loc is about the thickness of a pencil. if they are too thin, you'll experience breakage down the road. if they are too thick, it will take longer for them to matt and loc and the individual locs will be heavier as they mature, which can cause stress on your scalp years down the road.
2. you do not have to forgo cleansing your scalp to form locs. your scalp should be shampooed 1-2 times a week just to keep sebum and perspiration washed away. don't worry about coils or twists unraveling. redo the ones that become undone or just leave them alone and let them loc that way.
3. choose a residue-free shampoo. you won't want to use conditioning shampoos that leave your hair coated, nor will you want to use leave-in conditioners, as they attract lint and dirt, which will embed in the locs and make them dirty and difficult to get totally clean. your focus should be on cleansing your scalp. a light, natural oil smoothed throughout your locs should be an adequate conditioner. avoid wax, shea butter, cocoa butter, coconut oil, pretty much anything that is solid at room temperature. it will create a nasty buildup within your locs that will never come out, no matter how much clarifying you do. trust me, i've seen it, and what you'll end up with are clean-looking locs on the outside, but nasty ooze from product buildup on the inside of each loc, which will make them feel heavy in time. clean locs should feel light and spongy, regardless of texture.
4. some people have good results with liquid castile soap as a shampoo. just be mindful to dilute really well because these soaps can leave residue if you aren't careful.
5. personally, i would use a nonsoap cleansing method like a baking soda paste with a couple of drops of oil added and rubbed into the scalp, then rinsed away. or green clay, which is a good skin cleanser and will wash away easily under a steady stream of water.
6. buy a nice scarf (satin, cotton, silk, whatever) to keep your hair wrapped at night or when you are lounging around or in windy weather when dust is blowing around to prevent lint and debris from becoming trapped in your locs, as you won't be able to brush or comb or even pick out debris as easily as you would with loose hair.
7. be patient with the formation of your locs. if you have multiple textures on your head, as many people do, you may notice that parts of your head will loc faster than others. everyone goes through an awkward stage of locing in the beginning. you can use scarves, head wraps, etc., to get through those periods.
8. your locs can be manicured, meaning, you will want to keep all fuzziness at bay by twisting your newgrowth regularly, showing evenly parted sections on your scalp. or you may want semi freeform, where you simply gently pull apart your locs after a fresh shampoo to discourage the fuzzies from matting and connecting locs. or you may want to have organic locs, in which you will let your hair do what it will do, creating spaghetti thin locs in some places, and fat ones in other areas. most people don't wear organic locs, especially if they plan to work in corporate environments. if you plan to have manicured locs, just make sure you don't overtwist them, as the constant twisting of the new growth can weaken the base of your locs and create breakage down the road. there are some people who use crochet-like hooks to keep the base of their locs from fuzzing too much. it's called latching. you can do a search for that. personally, that seems too time-consuming and unnatural. but everything isn't for everyone.
i don't know of any cons of having loced hair. as long as they are clean and clear of lint and dirt, as long as your scalp is regularly cleansed from the beginning
and is healthy, your loced hair can be as flattering and fun as any other natural hairstyle.