Hey Shawnda, sorry to hear about your phone's soda problem—caffeine addiction is a serious problem among many of today's phones. We don't have a liquid damage troubleshooting guide specifically for the Evo 4G, but our iPhone Liquid damage guide might give you some ideas on what may be damaged inside your phone.
As for disassembling your particular phone, as well as specific guides to replacing screws and contacts that may be broken, check out our HTC Evo 4G guide page. We offer 13 different repair guides for your exact phone!
Hope this helps! Good luck, and let us know how it goes.