What do I need to change my SIM card reader

You are asking for a lot of information when that information is already widely available on the internet. Soldering and especially micro-soldering, is a skill that is acquired through trial & error, patience and perseverance.

It also depends on the type of budget you are willing to invest. Is this a one-off repair or are you looking to become more skilled for future projects and repair? There are quality tools that will make this kind of repair relatively straightforward. Low-cost tools can work but you need to have a lot of skill to compensate for their inherent weaknesses. For example, there are videos from Vietnam that show you how skilled repairers can do near-magic while working with the barest of equipment (I wish I could understand their commentary).

To be honest, starting to solder on an iPhone is a recipe for disaster. Regardless of the equipment you have or will buy, start practicing on old electronics first. Some through-hole pcb's and then SMD.

I would highly recommend you look at youtube channels such as:

iPadRehab: https://www.youtube.com/channel/UCPjp41q...

Louis Rossmann: https://www.youtube.com/channel/UCl2mFZo...

EEVBlog: http://www.eevblog.com/

They have specific videos on the equipment and concumables they use. iFixIt also has a great series on micro-soldering (https://www.youtube.com/playlist?list=PL...) that is well worth watching.

Perhaps others will add more details but I just think you need to do a bit more research first before attempting to repair an iPhone.

Welcome to the fix-it world and good luck.