That wasn't me Vash!
It wasn't even close to half a page! LOL
While I will agree with Vash and say that the "best" scenario is having a technician do the job, it is mainly due to the tools and parts being available and other then the tech visit, and there is no additional costs for them. I still have to concede that a capable DIY'r with a grasp on things can do the job him- or her-self. The cost is really the only place I throw the caution. With an HD receiver on the account, the likelihood is that there is an HD dish of some kind with an open port. Even in a hybrid install, there would be an empty port on the LNBF or switch. The pre-existing RG6 just needs to connect to that empty port and may require an "extension" to do so.
Littlebill, if you don't already have the tools and do have a Service Plan, I would say get a tech, the cost being only $15. For everything you need to install a new box, to include separators and diplexors if needed, plus tools, fittings, and cable, even the $95 without a Service Plan may end up being the most cost effective way to go (sad but true). Being that this website caters to the self-help movement more so then drumming up business, I would always give you both options as TommyF did. We can readily explain the parts and tools list you would need to Do-It-Yourself.
The other thing I would mention to you is that if the only reason for a new receiver is HD capability and not additional recordings or other features, you may find a simpler installation in the future. Scott made mention of the new Sling Receiver 300U in his CES vid (awesome BTW) which will be available in the [relatively] near future, and with a purchase, the monthly rate should remain the same. Another receiver unto itself guarantees the opposite, and your monthly charges would go up a minimum of $7 with that option, regardless of who installs it. Being that you have the ViP922, you will have options. I guess it boils down to how soon this change needs to happen for you, how comfortable you are with directions via SatGuys, and even what tools you will need in the tool belt
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I guess it depends what you want to do and when. I am pretty sure the vast amounts of resources and know-how in this forum can get you taken care of however you choose to proceed. P.S. Also, are you talking about a purchased receiver or a leased one?