The 300's have a screw hole labeled KB on bottom, unscrew that.
There's 3 tiny tabs at keyboard top to slide downwards with a pentip, keyboard lifts out. RAM slot is under metal plate removed with numerous screws.
Be sure tablet is unpowered and battery pulled first.
100% Old School tablet setup:
Sahara i440D - 4GB/500GB/7200 - Vista screams!
HP TC1100 1.2 - 2GB/160GB/5400 - Vista - portrait - primary computer.
HP TC1100 1.2 - 2GB/160GB/5400 - Vista - primary work computer.
HP TC1100 1.0 - 2GB/60GB/7200 - XP - laptop - partner's primary computer.
Acer 303xmi 1.6 - 2GB/100GB/7200 - Vista - laptop - work computer.
Motion M1300 1.0 - 2GB/60GB/7200 - Vista - semi-retired (needs repair).
Motion M1300 - for parts.
Motion M1400VA - awaiting resurrection.