But remember who is in charge. The Republicans can change and set ANY rules they so desire any time. Their confirmation hearings DO NOT have to be long or even be at all. The constitution does NOT require hearings, lengthy or otherwise. The Republicans can short circuit the processes in any way they desire and the Democrats have no power to stop them.
So let's suppose you are correct and Trump does appoint a nominee. In years past some Justices have been every bit the nightmare that the opposition believed them to be. Some, like Chief Justice Roberts and Justice Kennedy, have become moderate, swing votes who don't seem to explicitly pander to any particular partisan view... which is ideally what the law proscribes.
There are reasons to think that the following list are front-runners. Of this group, rank from the least bad to absolute nightmare scenario.
Thomas Hardiman
William Pryor
Diane Sykes
Amul Thapar
Don Willett
Raymond Kethledge
Amy Coney-Barrett
Barbara Lagoa
Edited by Hyroglyphx, : No reason given.
"Reason obeys itself; and ignorance submits to whatever is dictated to it" -- Thomas Paine