Trying to catch your betta can be tough, but even if it's easy you could still hurt them or damage fins. So how do you catch them? I dont use a net unless it's my last option.
I save the cup from when i bought them and use that to scoop them up. Then i walk past the tank they swim to the top and think they are gonna be fed so i lift the top like I'm feeding them and scoop them with the cup and thats all their is to it. If you don't have a betta tank and still have yours in the cup please consider some of these betta fish tanks.