newbie question - barrell changes

[handi270]

Hi to all,
I bought a handirifle in .270, this was used, but in as new condition.  I have sighted it in, but did not get to hunt with it this year.  Also had a trigger job done and it shoots much better.
I would like to have other cals. to use, for instance .223, maybe a 45-70.
I know that the factory will sell and fit a new barrell to the action, yet I see a sell/trade area here.
Can an individual buy and install a diff. barrell?  Do you need a gunsmith to do it for you. I don't mean the physical changing of a barrell, but checking headspace, etc.
Really enjoy this site, lots of useful info.
Thanks in advance.

[coop2564]

Check the stickys above on barrel fitting.  You can do it but its pretty involved.

[handi270]

Thanks for the quick answer. Good info in the FAQ's.
Got to think about that.
Maybe spending the money toward a complete gun is a better solution for me.