How long is your hair first? Styling and current product that you're using?

get a haircut every 3 weeks. that should keep u tidy. or other wise go for bald fade or like me i always go for a razor fade. i also have a pretty messy and easily grow side hair and with that hair style my side hair will look nice for a month or so before i need another haircut.

as for trimming.... well unless u know what u are doing i advise against it. even myself who can cut hair (no im not a barber, just somebody who loves cutting hair and been doing that since i was 15 years old) wouldnt trim my own hair because of too many mistake can happen. Unless ure going for a buzzcut.... still i advise u against it.

even go to a those indian barber is still cheaper and u got a nice haircut.
get a good clay product. not out of the shelves one, invest in a good clay product like firsthand clay or something like Pristige clay

there are also alot of good oil based pomade too if u want to look slick but some ppl just dont like it because its a bit difficult to wash. (not really if u know how lol) but in terms of best kept hair oil based is usually i would look for. most of local pomade like gonzo and straits of malacca or vintage armor have a very good heat tolerance.