No, you do not need a professional to set up a RCA HDTV. They are fairly easy to install.
"No, you do not need to hire a professional to do plumbing home improvement. There are various books that can teach you what you need to know. But, it is advised to hire a professional."
The TV with a large screen came before HDTV ever came out. I have an Old Projection TV that is over 25 years old that is kept in the basement. Most new TVs are made with HDTV, but they do not need HD programming and can receive standard 480i shows on a HDTV.
If you need a person to translate from one language to another, then you would probably need to hire them. There are professional translators who do translation as a job.
As projectors age the tend to lose FOCUS first. You might need a service call.
Although you do not need an HDTV for an Xbox360 to work you will need an HDTV to be able to get the most resolution out of your Xbox
You do not need to hire a professional but you may Want to ask a friend to give you a hand.
You do not need a professional to fix a fence all you really need is hammer and nails and a bunch of elbow grease, and a level and a pick and a shovel, and some paint.
You will need an antenna and a HDTV with a tuner built in. You will then get your local channels in HD.
Although you can install this yourself if you are handy, leaving the installation up to a professional will ensure the unit will look the way it was intended.
It is suggested that you hire a consultant that will guide you to meet your goal.
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Wood blinds are easy to install and are definitley a do-it-yourself kind of project. You do not need to hire anyone to install wood blinds.