you should say where do you live? so nearby people may give you a hand to install. but it's not so easy to aim at right angle immediately. need to try, try, try... if you want an easy job, just hire pro installer to do that for you.
JP spec isn't suitable for TW cable. even use fine tune, you still no way to get all channels, no MTS/SAP. for cable, get Pio 745 which is best choice now!