Over-budget for lighting, under-budget for everything else.
Thinking your home reno quotation will take up most of your renovation budget of chandelier lighting, and setting aside too much money for it alone. After all, most of the discussions here are about comparing reno quotations. In reality, your reno quotation will probably be only 60-70% of your renovation budget. Items necessary but not included in the quotation, like electrical appliances, lighting fixture, furniture etc, can really add up!
Start with your final renovation budget (all things in) in mind, then work backwards. Reverse engineer your renovation. I think most people bust their renovation budget because they don't realise that there are many things which the ID doesn't provide. Home decorative lighting and furniture are the obvious examples, but there are many others, from lighting fixtures to bathroom accessories, curtains to mattresses, which are necessary for the house to be actually liveable.