things are a lot different in Forex trading than it is in bitcoin and then it is nothing like trading altcoins.
in Forex the market is huge and analysis,... works well there but still is a little unpredictable.
in bitcoin trading, you can be sure it goes up so you have a safety net even if something unpredictable happened and you made some wrong trades. and analysis works a little.
in altcoin trading nothing works, no analysis no prediction, nothing. it is all manipulation and pump and dump. you should always buy it low and sell at the speed of light when price goes up or otherwise lose money when they dump it. and that is the skill in altcoin trading.
Depends what altcoins you're trading. Some altcoins stay pretty stable up high even if there has been clear manipulation (like ETH).
Even with altcoin trading a lot of analysis can work, such as the background of the coin, developers, the coin's aims, etc. That's the sort of analysis that most people who trade altcoins need to take part in to avoid losing money. The great thing about altcoin trading is that most cash going into it is dumb money and you can completely take advantage of that without having enough money for a pump - most newbies don't do this analysis before buying the coin.
Also, with Bitcoin there is never actually a guarantee that the price will rise. It's a very risky trade in itself, and the price rising for a long time is only because people keep investing in it, when in fact Bitcoin naturally would be inflating due to an increase in supply.