If you can get a wrist strap for like, free...the it's worth having one...but so long as you touch the case prior to doing any work there are no worries of frying the mobo or parts...
No, the object you are discharging yourself to does not have to be grounded. Given that your feet are on the floor, you will actually become the ground. Yes, if you touch the back of the case or the power supply housing while the pc is unplugged on a table you will be ok. It's not that you have to discharge to a grounded pc to rid yourself of static it's that you have to "equalize" the static charge between you and the pc. If, prior to working on your pc, you touch the case and you get a slight static shock, that slight shock is the static charge difference built up between you and the pc being disharged and grounding out thru you to the floor. Hence, touching the case and or power supply prior to working on the pc is just fine. With that said, given you may get a slight static discharge from your pc prior to working on it, you do not want the mobo, memory, processor, or any slotted components to be the first thing you touch, that's how people fry their parts, always touch the case or psu first.wen touching a metal object to discharge yourself does it HAVE TO BE grounded? i mean if i touch the back of the case wen the pc is on a table is that ok?
This is the ONLY place I've found a post anywhere on the internet that tells me where to attach the alligator clip.