newbie here 
with small fingers Bought 5k when price was around 50k. Nows it’s dropping and I’m panicking 
How to overcome panic and think about stopping loss?
Don't look at the charts, are you a planned long-term holder? if you do, you just have to calm yourself and don't look for the charts for a few days. Looking at it will definitely hurt you because you see the value of your money dropping down. Buy another batch at these prices, it's a good counter reaction during every dip. with small fingers Bought 5k when price was around 50k. Nows it’s dropping and I’m panicking How to overcome panic and think about stopping loss?
When will you determine the most appropriate time to sell?
When you're in profit or if you want to stop loss then maybe somewhere around 10% of losses or before it goes there.