Generically speaking... as I did it on MB.
1. Air compressor with spark plug adapter to keep the valve up while removing the spring.
2. Spring compressor
3. Magnet
4. Assortment of pliers
5. Hammer
You really do need a service manual to quide you through this.... assuming you are not removing the cylinder head. Sometime it is not just the seal that needs to be replaced... but the whole valve stem is loose.