One thing at a time. This is the simplest and best way to start reducing your stress, and you can start today. Right now. Focus as much as possible on doing one thing at a time. Clear your desk of distractions. Pick something to work on. Need to write a report? Do only that. Remove distractions such as phones and email notifications while you’re working on that report. If you’re going to do email, do only that. This takes practice, and you’ll get urges to do other things. Just keep practicing and you’ll get better at it.