I quit trying long ago... When I decide to buy I but about 10-15% of the position.. If it goes down, rebuy, and down, rebuy again.. If it spikes up hard, take it and seek to get back in on the next base..
It will take me a week to get a full position, and the last buy into it will probably be Friday in the last few minutes of the day... And I seldom have a loser. But, I hold for few months to a few years.. AND I NEVER BUY A SPIKE, NEVER.... …..Buy the base... That's where we are here.