There will never be a perfect time to invest, more than likely, unless you're extremely lucky, you will buy and experience both dips and peaks. If you can afford to lose your money invest it, if you cant, don't.
At the moment prices will be lower than they have been due to people cashing in to pay for their Xmas shopping. I would expect that, and this is purely speculation, once the banks reopen, after the Xmas break, prices will probably bounce back up. But, that said, they will probably drop down again for new years/around new years due to people over spending when celebrating the date changing on the calender.
I agree. Even if you actually wait for it the whole day, there is no assurance that the price may drop in a favorable value that you can afford, or at least, based on your evaluation, would be the best time to buy and increase your assets. I think that instead of waiting for that moment, which is quite difficult to catch. The better move is to set the profit margin to aim. By doing this, you can either hold or sell your holding of coins, if you see that the venture could give you some good profit based on the capital you used for it. If the venture would only amount to a loss, then why would you even think of going for it in the first place.