Upgrade msi pe60 7rd

[Nobodyandeverybody]

I have recently bought msi pe60 7rd and loving it. Just a problem though, the ssd is 128gb only. I want to swap the ssd with a bigger one. What type of ssd I need for laptop and can I do it myself or the shop is the better option?
Ps.
I have already void the warranty by upgrade the ram. So, if I can change it myself will be chaper.

 

[hang-the-9]

Upgrading the RAM should not void the warranty, buyers are expected and allowed to do that.

For the SSD, any NVMe M.2 drive will be OK. You can easily clone the existing one to the new one using Macrium Reflect free version. You can do it yourself, should not be much harder than adding RAM.