For this method to work, u will need a minimum of $250 BTC investment.
Yes its not 100% safe.
Works best if you have a US address.
It will take longer time if you are not from US.
If u are not from US then u will need to prepare more than $250 of investment.
OP needs to give these details as these are very important to those who wanted to buy.
There are some more things that u need to prepare so the initial investment will be more than $250.
Take note.
$250 is not required, but the more you invest the more you save.
You can do this with even $50 but you wont make as much profit as you would if you did $250 or more.
Does not necessarily take longer if your out side of USA you just need BTC / a way to charge US Dollars.