As this type of work can be so unpredictable (trust me, I've spent days tearing my hair out over what seemed at first to be the tiniest bug), I will size each piece of work as I begin so that you know exactly what to expect in terms of time/pricing. Then we can discuss if it makes sense for me to address it based on the cost to fix. If you decide to move ahead with it, I will update you through the way on progress.