I need help selling my item on eBay?

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I just made an eBay account and I put up my first item up for sale last night. I now have a couple of watchers and I recieved a message from someone asking if they can purchase my item for a price lower than my fixed price, I am not doing the auction.
Right now I have 4 days left to sell my item. I wanted to know if i am I able to change my fixed price to attract more buyers? I was planning on doing this to see if I would recieve anymore messages from people willing to buy the item at my price and I know theres a time limit when you can change information on your item.
Also, do I have to sell the item right when the 4 days are up? Can I sell it earlier, like for example, tomorrow morning If i just put it up yesterday? in case someone is willing to buy it from me today.