Could you please answer my questions? (It's hard to say that on a computer without sounding rude

)
Erdbeereis
The tutorials were an attempt to answer your questions, while providing much more information than a couple answers could convey.
1: Do I need to make a press, or can I stand/sit on pieces of scrap wood with foam?
The kydex has to be pressed to be formed to the shape of the knife. So, when you use 'scrap wood with foam' you have in effect created a press. But, if you are going to do a bunch of sheaths, I have found that a hinged press is much easier to work with. In one of the tutorials you will see that the maker uses square pieces of wood, with foam glued to them, much like you are describing.
2: Can I use a normal oven, or do I need a toaster oven?
A normal oven will work just fine. And to Kiah's suggestion to use a cookie sheet, I would add that a non-stick sheet is even better. But, in the tutorial by Sharpshooter, you will see that he uses an Electric Griddle. And others use a heat gun.
3: How do you attach a belt loop/clip to the sheath
Commonly this is done by bolting the belt attachment to the sheath, through holes drilled in the sheath, with chicago screws or similar... These are variously called 'hardware', mounting assemblies (
http://www.knifekits.com/vcom/product_info.php?cPath=41_56&products_id=1136 http://www.blade-tech.com/Hardware-for-Tek-Lok-pr-825.html), binding screws, and as Kiah has stated.
But, Steelnut uses velcro to attach belt clips, and I have seen clips glued to sheaths, formed integral to the sheath, and attached with zip-ties.
4: Do you need a bandsaw or jigsaw, or can you use something else?
For what operation? For blanking, I use a razor knife to score the material and snap the pieces apart. For shaping, I use a grinding wheel. For finishing I use files, ScotchBrite, a knife and a buffer.
I hope that is helpful.
Kind Regards,
Marion