Ecm removal

Let's start with: why are you replacing the computer? Very rarely does it ever need replaced. You likely should not be tackling it. And, if you're asking what tools you need, you definitely should not be touching it. Honestly, you can cause significant issues and damage if you do not have any mechanical experience to know how to diagnose, repair and replace components. Seek the assistance of a professional who will save you money in the long run, when the parts you spend tons of money on don't fix anything.