Knowing that investing in bitcoin is a long time investment, you should plan better and keep aside the money for investment as this will help you avoid anything that will alter your reasoning because as an investor you must be psychologically stable.
although the term HODLing tend to suggest that you have to hold it for a little while, investing in bitcoin isn't all that a long term investment as you suggest because the volatile nature of Bitcoin depict that you could have a reasonable returns even after a few month of investment unlike other asset like land that after buying, you have to wait for as long as five yeas upward before the value of the land will appreciate. We've seen the price of bitcoin rise to $42k this January and then dropped back to around $39k this same January so buying it now and after a week or two the price goes back to the $42k, if you sell it at that price, you've made your profit within the shortest possible time.
You are wrong and you are misunderstand what HODL! means. What you just stated is a short term,and traders are known to be this ones involved in such practice. Hodlers don't sell within one month, keep hodling their investment for a very long time like 4-10yrs and above. Some hodlers use their bitcoin as a lifetime investment. What is said is a bad way to handle your bitcoin, because if you are after little profit from bitcoin price fluctuation, you will never have any bitcoin investment in future. The best thing as a newbie is for you to have the mindset and plan of a long term investment, so that you can limit the same risk attached to the volatile nature of bitcoin, and so that you can also have enough time to grow your invest, so that in the long run, you can have a good profit from your bitcoin portfolio because as the time passes on, bitcoin price is always going up, which is your reward for still holding.
Imagine that because you bought bitcoin price at 39k, and bitcoin price moved up to 42k, and you sold your bitcoin. The next thing that you see is that bitcoin price keep on going up, and when it moved down, it never moved down below $43k, it means that you can't buy back the same unit of bitcoin when you sold. OR when you bought at $39k, and bitcoin price didn't move up but instead it went down below $39k stayed there for let's say one to two months. It means that you will panic and sell, and run at loss because you are only after bitcoin price to move up within a very short term which tend not to happen during your own speculated time.
You will only give yourself more pressure and stress because you will be restless since that is what you plan to do with your bitcoin. Traders or short term investors can never make the kind of profit that they will get if they trade for ten years compare to a hodler that you was able to increase and accumulate his bitcoin regularly through DCA method weekly or monthly. As someone who wants to start investing in bitcoin only think of accumulating and not selling, so that you can so that you can increase your bitcoin portfolio size, because bitcoin is worth holding than selling for little profit.
Also, timing the bitcoin market earlier will give you an edge over the market as the higher chance of profitable investment will be there instead of investing late.
It is difficult to time the market and that is a waste of time, because nobody can predict the price movement of bitcoin. It is better to get started the moment you have the money to invest and keep on growing your invest by buying regular either weekly or monthly, and all necessary funds are in place that will not make you think of selling your bitcoin.