Before first sync - duplicates in Library. Rebuild?

[Cardinal24]

OK. I am a beginner, so I understand NOTHING.
This is probably a VERY basic question.
I use a PC - not a Mac.
Here's my situation:
My iPhone was having problems so Apple tech has me totally reset it.
The initial reset put my Contacts back on my iPhone, but zero songs - because the song-checkbox wasn't checked. I am preparing to sync again.
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All of my 1000+ songs are in either of 2 folders on my PC.
In preparing to sync, I managed to duplicate all the songs.
Can I do the following?
Highlight and Delete ALL the songs in my Library.
Add the 2 Folders.
Sync.
Is that OK. Would that work?
Thank you.

[jamesus]

That should work. Be mindful to not move the files to the recycle bin, but rather just remove them from iTunes library.