Cable TV at RV park

Is there anything out there showing how to change over to HDTV? Showing how to take out that old heavy TV and installing a flat screen TV? I could do it but prefer to have something showing how this is done. I am not sure what all is in that upper cabinet above the passenger seat because it has been at the shop getting some work done to it and have not even had a canch to see what all I have and never even tried out the tv at this time. I know there is something there that has a red light on and it,could be a converter box not really sure what it is. Only had the rv for about a month and been in shop getting the cruse and some other work done to it. Will check more into it when I get it home. Now waiting for a part they ordered out of Washington state to keep the RV from being wipped around when the big rigs pass you and also the high winds from moving you around. That should take about another week. I have had anything done that needed to be done to the rv to make it safe and I like everything that is suppose to work to work. Lights etc. Had it winterized and glad I did. Got into the 20's a couple of nights. Again, thanks for all the advice. Really appreciate it. I will accept all the help I can get. :-)