its pretty straightforward process for adding ssd and upgrading ram since there is separated back cover for ssd and ram but if you want to repaste the heatsink, you need to open the case fully and take the motherboard out of the case. its not that hard to do it, if you afraid you cannot reassemble the laptop, just record the disassembling process. just note that the first thing you need to do before anything is unplug the battery as soon as you find the battery cable connector.