This is what I do to roast pumpkin seeds. As I am lazy and don't really want to go around buying special ingredients, here is my bare bones recipe for yummy roasted pumpkin seeds. You will note that I use the words "or so" a lot in the following recipe. Use this as shorthand for "improvise as required". This is a recipe that MacGyver would use in a pinch. This has been reposted several times, but works good every time!
1. Wash the pumpkin seeds. I have not found a quick and easy way of doing this, nor of getting the pumpkin seeds separated in the first place. I assume that the only way is manual labor.
2. Lay out the pumpkin seeds on a cookie sheet covered with aluminum foil. Improvise as required if you do not own a cookie sheet or aluminum foil. I think non-stick aluminum foil would work best, but use what you have lying around.
3. Salt them pretty good.
4. Put them in an oven at 250 degrees F. According to my house of conversion, this is about 120 degrees C.
5. Using a spatula (or pencil or stick or something), move them around every 20 minutes or so. The idea is that you don't want them to stick to the aluminum foil, burn, etc. You want them to dry out evenly.
6. They should be done in about 3 hours or so.
That's it! Eat and enjoy. I know other web sites have you adding oil and such, but if you are a bit culinary impaired (like I am), this is an easy way to get a nice result without too much work.