I wouldn't do it. It doesn't sound like this upgrade is urgent so why rush into it without having everything you need? Your boss has delegated this task to you

I wouldn't do it. It doesn't sound like this upgrade is urgent so why rush into it without having everything you need? Your boss has delegated this task to you. That means you have the authority to decide how/if it should be done. When they return just explain that you would rather get it right the first time.