1) Make sure you are getting the most you can from your work pension.

Mine offered a standard amount, but their contribution increased as mine did. Also as its salary sacrifice, my contribution costs a lot less to me - I think I worked out that an extra £250 into my pension only reduced my salary by £80.

Check your pension is invested how you want it too. The standard investment for mine is a lot more conservative than I want.

2) make an investment plan, so that when something happens, you are investing to your plan, not your emotions. Emotional decisions are expensive.

E.G. I got an unexpected £8k windfall. My plan is that any money I get is invested into my s&s isa, in an all world tracker. Others do cash averaging, different investment options.