This can be done by a noob (if the site doesn't use JavaScript to load/present data). I'd recommend WWW::Mechanize over LWP(::UserAgent) because it is LWP::UserAgent under the hood and has much better and more browser like controls.
Hurdles include: DB design which is easy to do badly if you've never done it and that will make everything much harder. ETL is pretty easy but only after you've done it several times. For a noob, even a technically gifted one, this is a project that would fill up a couple full time weeks at least.
You'll probably get good advice here if you ask at each stage after you've tried to work something out for yourself. E.g.: I wrote perl-xyz to do stage 1 of project; is this a good way to do it?