To do an Audio IC repair, you need both the soldering station and hot air station. The hot air station will allow you to remove, reball and solder the audio IC in place. The soldering station will allow you to make the micro-jumpers necessary to complete the repair. Of course, you can get the Quick Hot Air Station which is really good but much less expensive than the Hakko. However, for the soldering station, I highly recommend the Hakko.
Of course, you also need flux, solder, tweezers, various consumables for cleaning etc.
This is a considerable investment in cash but also time, don’t do your first micro-soldering repair on an otherwise good device…not to mention that the Audio IC is a deceptively difficult repair with plenty of gotcha’s that can turn your phone into a brick. If you do this, get some dead or iCloud locked phones and practice a lot first.