In the end, if you really want to write, you just have to do it. Reading a book about it may help – but it may also be a bit like sitting disconsolately on the edge of the pool with a book called How to Swim.
Jeremy Treglown writing in the Financial Times, and reviewing several books on helping people to learn to write well.
One of the books he mentions is Jurgen Wolff''s Your Writing Coach
It's a book I keep thinking about getting, but as Treglown says, it's a matter of sitting down and doing the nitty gritty of writing, if you want to do it. There's no easy way to write, any more than there's an easy way to build a house.