I know this is a bit old but for future reference, you can open the Spectre (and almost all HP laptops) and replace the SSD and wireless card very easily. Torx T5 screws on the bottom cover, then a single screw holding in the SSD/wireless card. If you've replaced components on other computers, this should take less than 5 minutes.
RAM is not upgradable on the Spectre x360 (it's soldered to the board), but on other laptops it might be. Check the service guides.
No adhesives or special tricks, although be careful when removing the bottom cover, especially around the hinges on the x360 systems. And of course, shut down computer, unplug power adapter and battery before swapping components, and take proper precautions against static charges.
A full service guide with detailed instructions for replacing every component is available on HP.com for every single laptop (search your model such as "spectre x360 13-0000", look for Service and Maintenance Guide).
It won't void your warranty, although if you ever have to send your system in for repair, be sure you remove your own parts and replace the original ones.
Also if you're replacing SSD, you can get a copy of Windows 10 from
https://forums.windowscentral.com/e...Fsoftware-download%2Fwindows10&token=AWIl7eO_
No product key required. It will detect the key embedded on the system board, and activate automatically.