The best glossaries are those that are arranged alphabetically with numbers first then characters. Don't waste space trying to define every word in your technical manual. It isn't necessary to rewrite the dictionary. Stick to only those terms that are unfamiliar to the reader. Do give the reader a definition that is easy to understand and doesn't include a form or variation of the term.
Nothing is more frustrating than to read a glossary that uses the term in the definition.
Don't include procedures in the Glossary. Keep your definitions short and to the point. If a procedure is necessary, refer the reader to the appropriate section. Procedures should never be included in a glossary. Do imbed definitions in the procedures for more difficult terms.