Do you mean PSU?
Depends on the case, but most are very easy, and you probably wont use all those wires/connectors. If you look closely, you will find theres only about 6-12 'bunches' of wires going to their connector, just think of each bunch as 1 cable.
If its a tower/midi unit then its especially easy.
Unplug all connectors from drives, motherboard and anything else that is going to psu.
If you have to touch the main board (if conns are stiff etc), its best to touch a grounded metal object (the case will do if you have earthed sockets) to get rid of residual stat, and try not to touch any silver or chips if you can help it.
Once you have grounded unplug the psu.
Then while holding it in place as you dont want it to fall :O, unscrew the mounting screws (usually on the back on a tower case) , then it should just pop out. Sometimes you may need to remove the drive bays too.
As for remembering where each goes you usually find they only go back in one place and one way round (although you have to be careful with power conn on very old MBs)
If youre that worried simply put a number on each connector with a permanant pen (NOT A PENCIL OR METALIC MARKER!) then match them to the new ones outside the box.
If you have to unplug & move the drives, make sure the red stripe goes to pin 1 (although most are keyed so they only fit one way)
Most manufacturers have websites for this showing step by steps. (follow mine at own risk :)
Depends on the case, but most are very easy, and you probably wont use all those wires/connectors. If you look closely, you will find theres only about 6-12 'bunches' of wires going to their connector, just think of each bunch as 1 cable.
If its a tower/midi unit then its especially easy.
Unplug all connectors from drives, motherboard and anything else that is going to psu.
If you have to touch the main board (if conns are stiff etc), its best to touch a grounded metal object (the case will do if you have earthed sockets) to get rid of residual stat, and try not to touch any silver or chips if you can help it.
Once you have grounded unplug the psu.
Then while holding it in place as you dont want it to fall :O, unscrew the mounting screws (usually on the back on a tower case) , then it should just pop out. Sometimes you may need to remove the drive bays too.
As for remembering where each goes you usually find they only go back in one place and one way round (although you have to be careful with power conn on very old MBs)
If youre that worried simply put a number on each connector with a permanant pen (NOT A PENCIL OR METALIC MARKER!) then match them to the new ones outside the box.
If you have to unplug & move the drives, make sure the red stripe goes to pin 1 (although most are keyed so they only fit one way)
Most manufacturers have websites for this showing step by steps. (follow mine at own risk :)