Most of those things are not fixed by tweaking Joomla, they're tweaked by fixing the CSS and the php code that runs Joomla. Like most things involved in web design, they seem simple, but are actually pretty complex for a beginner.
Are you interested in learning how to actually DO the work involved, or are you just interested in it being done? If you're curious and want to learn for the sake of knowing, then tweaking something like this would be a great place to start. If you just want to get it done and get down to the business of running your store, it would be well worth your time to hire a pro. It would take them an hour or two, it will take you days.
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