1. Check if next lane got car with side mirror. if you can still see the car in ur side mirror, means u got space to change lane.
2. Stuff ur nose into 1/4 of the lane first. At this stage, the car behind might horn or flash high beam at u. but if ur maintaining same speed and did not press brake, u'll be fine. just do NOT slow down.
3. Put signal. This is to prevent the case where the car behind do crash into u, u can argue that u already put signal and scold the fella 99.
4. After you enter 3/4 of the lane, accelerate even more to put more distance between the u and the car behind. this is to prevent the aftermath of step 3 from happening.

Weird but true You have to do every single thing opposite from what you learn in JPJ.
And the steps above does not apply if the vehicle next lane is a motorbike. they wont slow down or give way one. in fact they might purpose go nearer to you and let u hit them then they start their oscar-award winning acting skills .

in fact, might be safer for u to drive "recklessly" in penang haha....