[spicyusername]

One reason it's difficult to "time the market" is that doing so involves selling when it's going up and buying when it's going down, exactly the two things that are most difficult, psychologically, to do.

Time in the market is better than timing the market.

[vunderba]

That's one of my favorite expressions - I think I first heard it in the Bogleheads subreddit. The redditor in question was trying to help a first time investor with a traditional three part portfolio (domestic, international, bond).

[johncreatescode]

I've been there. the anxiety of not knowing if it's the moment to sell, or if I would just lose extra gains.