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How difficult is this job? According to my boiler guy, I need to replace my 30 expansion tank with a 60 (or add another 30, which would require the addition of a “T,” which work would cost more than the savings from purchasing the smaller tank). To me, it looks like it just involves cutting off the water to the tank, unscrewing the old tank, teflon tape, and screwing on new tank, and adding support from a ceiling joist. I’m pretty handy, but generally hesitant to mess with the boiler. Can I do this myself?

Don’t worry, I will also be asking boiler guy before proceeding, but wanted to put the question to you folks, too.