I will soon be replacing the PSU in my Dell Studio Desktop 540 and was after advice from those who have done it before.

I intend to replace the Dell 350W PSU with a Corsair VX 550W ATX PSU - can anybody confirm that I will be able to physically fit this PSU and that it will work without problems? This Corsair PSU is "Standard ATX PS/2 size" and "supports the latest ATX12V v2.2 standard and is backwards compatible with ATX12V 2.01 systems", if that helps.

I have also read conflicting things about Dell desktops and PSUs - one forum said I need a specialist adapter to "convert a 20 pin atx connector to Dell proprietary 20 pin connector" and provide a "Dell P10 connector"(?), while others have said replacing any Dell stock PSU with another brand can damage the motherboard. Some clarification would be greatly appreciated.

Furthermore, is there any more general, helpful advice for someone who is replacing their PSU for the first time? Obviously I don't want to screw this up and fry my computer! How difficult is it to do as a first-timer?