I currently have an HR21 and HR24 Whole Home (DECA) setup with a Slimline 5 lnb (SWM) dish and a 4-way SWM splitter. DTV offered me a HR34 upgrade for $99. with a 24 month commitment and said all I had to do is swap the HR24 with the HR34. No installer required. Is this correct? How do I go from 4 tuners to 7 without any changes in my current setup? What else, if anything do I need to be aware of, since I am on my own? Thanks for you help.