Welcome bjean. Feeling scared or anxious is really normal in the beginning. Also having new symptoms the first couple of months of your quit can be common too (i.e. tightness in the chest, coughing, irritability, insomnia, etc.). Those are all temporary......I repeat: temporary. The rewards of better health will come, and you'll be amazed when they do. Remember that there is no such thing as "just one". You must now live by the NOPE philosophy: Not One Puff Ever. You can even go to the Daily Nope section on this forum and commit to not smoking just for that one day. The commitment is both to yourself and your fellow members here. It really is helpful the first several months.
You've given yourself the best gift possible. Focus on the good that will result from this decision instead of dwelling on the negative deceptions peddled by your addiction (such as worrying about a three day weekend). There will never be a perfect time - except right now.
I don't think anyone would object if you choose 8/29 as your quit date as long as you don't put another in your mouth and light it. You can go to the "QT Tickers" tab above and create a ticker to count your elapsed time, smokes avoided, and money saved.
You can do this!