I have an iPhone 4 & are having wireless issues with it. Long story short, the wireless issue has been narrowed down to my phone itself....I've ordered a replacment iPhone wireless anttenna & wil lbe repalcing it myself....My question is, do I need a heat gun to get the phone apart or will it open fine with just unsrewing the screws? Also, is this a complicated repair? I'm a PC tech with A+ certification but have neevr opened a phone bu sure it will not be greek to me. Thanks for any advice.