Either to be honest. I just don't want to put in 100 a month to wake up 1 morning to find rates have massively dropped
If that's going to cause you sadness then you shouldn't put a penny in. It could happen at any moment. People who put money in at the end of 2013 had to wait over three years to break even. There's a lot of risk however you want to look at it. Everyone here's taking it and that's why the rewards are potentially very high or non existent.
I agree. You can''t be in the trade nor in the investment market if you can't hold back your emotions, especially in the face of losses. Losses are inevitable as they say, thus, if you would lose hope immediately after experience some losses, then it would be hard for you to recover, plus the fact that you would find it difficult to keep going. So basically, in choosing an amount to invest, always consider a number that you would be okay even if you actually will lose it. I am not saying that you would, it's just more practical and forward-thinking to expect every scenario.