Homeowners can get permits themselves for all normal repairs other than plumbing. It's interesting that you can do your own electrical work, but not install your sink, and there's actually a reason for that. In short, the worst you can do by screwing up the electrical work is blow up your own home, but if you make a plumbing mistake you can contaminate the towns water supply, so they're very strict on that.
Make sure that you ALWAYS pull a permit, because most homeowners don't and get into issues later.
Also, make sure to take into account the fact that it's almost always better to buy something that doesn't need that kind of work - especially in the lower ranges. To buy a $250k home that needs 30K in work, means that you need come come up with 30K after closing. On the other hand, to buy a $280K home that doesn't need work would be a mortgage payment only about $100 more a month, and then it's turn key and ready to go.
There are so many lovely homes for sale that you shouldn't really have to settle for something beat up.
For a list of some new listings, go to http://www.shrewsbury-massachusetts.com
and you can check out the map based search interface.
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Shrewsbury's Top Agent since 1992
For more great information on the Shrewsbury real estate market, click the link below and check out my free video.