Without a light table, you can either:
1. buy an empressor tool
2. find a subsitute - I use the colored plastic end of some Zig markers I have:
http://www.dickblick.com/zz213/04/
Tape your brass stencil to the cardstock with removable tape (you can buy that at any office supply store). Flip it over so the brass stencil is on the bottom. Rub the empressor tool or marker end all over the design. This allows you to see where you need to emboss. Rub your finger or wax paper over the design. This step will make the stylus glide nicely. Now run the stylus around the design. Remove the stencil and you're done! I've been doing it this way for years. I'd love a Cuttlebug but can't buy it either so this works for me.
If you have any other questions or if I can clarify any of the above, please ask away!
HTH,
Anita