I can see that you're not quite getting an answer here. Unfortunately this board has a large percentage of Corolla owners and also more of the modern cars, so getting specific advice may take a while... if it ever comes at all. If you plan to change the springs, maybe the seals while you are at it, you can get by with just your basic tools required to work around you engine (such as a socket set, spanners, etc), and then it would also help to have an air compressor, and a valve spring compression tool. Once you have removed the rocker cover and all bits and pieces between that and the valves, removing the valve springs is pretty straight forward. Basically you remove the spark plugs, turn the engine so that the cylinder you are working on is top dead centre, then you apply compressed air into the cylinder at around 75psi or there abouts (through the spark plug area). This will keep your valves pushed up against the top of the head so that you can go ahead and remove the valve spring without dropping the valve into the cylinder. Drop the valve into the cylinder and then you will need to remove the head.