The elements of investing is great book and it's a short read. It's the very US-focused though but don’t worry about the fact that it's American not British…if you swap VTSAX for VWRL then it applies pretty much 100%. It's written by Charles Ellis (champion of low-cost index investing and non-executive director of Vanguard) and Burton Malkiel).
I was in the profession for 24 years. Please don't paint all financial advisors the same. Like all professions, there are a percentage of people that should not be practicing. Unfortunately, in the securities industry, that proportion is too high and not well enough enforced.
A good financial advisor can provide a portfolio that will match your tolerance for risk. This is the most important consideration. Others have given you advice on compensation, but also beware the advisors that sell returns on portfolios and not risks.
Provided enough time and savings, a diversified low cost portfolio that you can hang onto during downturns will make you wealthy.
Like many things, you can do it yourself but it may not be something you have the time or inclination to do. For example, I do my own taxes but have someone mow my lawn.
If you want to do it yourself, I'd recommend starting with reading:
If you engage a financial advisor, be sure to:
Good luck.