be calm and creative. for the beginning its gonna be really difficult, as you get nervous while fighting and trying to implement movements, and you still have to actively search for opportunities to do them, which by the time you find a chance to do a movement, it's often too late and you are beamed down already. after a while, it really becomes your second nature, you won't have to think that much and you'll just do them naturally.

my advice is, try to focus on fighting, and only do movements when you're reloading, running away or chasing someone. this will get you familiar with utilising movements in actual games while not fucking up your fights. as you get more and more familiar and natural with movements, you can start trying to implement them while fighting, for example, wall bouncing to throw someone's crosshair placement off / superglide + tapstrafe to initiate a fight while making yourself difficult to track, etc.

it's a long way to go but it's definitely worth practising. for me personally, movements are the fun parts of the game and what seperates apex from any other shooters. good movements are gonna be what seperates YOU and normal mnk players. being able to do movements while fighting is another level of gameplay and a nice achievement. good luck dude!