Khan,
There are specialty tools out there, but if you tape a single edge razor blade to a flat surface, you can use that, along with another razor blade, for most of the bends you need to make. Just slip the PE part under the taped-down blade to the right position, press with one hand to hold it in place, then use the other blade to bend it to the right angle.
The PE will bend much easier, and hold its shape better, if you anneal it over a candle. Use super glue or Gator's grip Glue to attach. A magnifier will be a big help too!
Good luck,
JimC
jimc@hillcountryhobby.com