These upgrade kits are plugin parts, so are pretty easy to install. The Sampling board is more difficult.
But be aware that this kits are essentially new old stock and we can offer little or no support for them.
Further, there are a number of parts in the H3000 which are entirely unavailable (this is why we stopped making them). As a result, problems can occur which cannot be fixed. You may want to consider this before investing too much in what is now vintage equipment.