The short answer is that it depends. What sort of information is going to need to be updated? Here
is a really simple web page I did for a client this spring. All he needs to update is the news items from time to time. If you right click on the page, and then select 'view source', you can see that changing the text is just a matter of, well, changing the text. Once the the text is changed, then it is just a matter of saving the changes to the server. A properly designed web page will have the stylistic information in an external stylesheet so that any stylistic changes should be easy also.
If there is text that needs extensive editing, like a price list, then it may be better to use .ASP or .PHP to include those types of information as plain text. Then the only changes that need to be made are too a text file, and no HTML needs to be touched at all. That makes development take a little longer, but only marginally. All in all though, HTML is so basic that it shouldn't ever be a problem finding someone to do updates.
EDIT: Incidentally, since you are a student in the US, you have access to Expression Web for free (as well as some other free software) through Microsoft's Dreamspark
program. If you can find someone that wants to take it on, you can mention that they can get the software for free.