Energy springs to mind! Most days I lack it after looking after an active 9mnth old!!
So how do I squeeze in writing time- either book or blog?? When she naps on me!
Finding time when you have a million other things to do just makes the achievement more worthy.
Talking of energy, the pace of the book is another topic of energy- how much downtime does your characters have? They cant all be action everywhere- like us they need time to relax and do hobbies etc…
Is it important to get into the action straightaway or slowly? How do you build up to the action? Too much energy exhausts readers but too little bores.