Trading without loss is possible to some point, and this requires large volume of capital investment. Here the focus should be over a specific asset. Only then it is possible to observe the market. A very minimal profit margin needs to be set for selling, and same is with buying. As the market is volatile we've got more chances of the trade getting executed in a short time period generating small profit.
I am not sure trading result depends on the capital. If you trade using big sums, the benefits can be great. However, the losses will be also sufficient if you make a serious mistake. Trading without losses is never possible.
Absolutely!
The more money you put in the more you have at stake in both directions, in winnings and losses. The spread is the same.
And you're right there's no trader in the world who hasn't felt their own mistakes - I bet you that! No matter what amount you deal with, small or large, you can't win without losing first.