A block under those case bolts by the point cover works good, make sure the bike will stay, before starting work.
When you crack the cover, a little bit will come out, it won't all drain back.
Don't worry it's just a teaspoon of oil.
A very thin screwdriver or punch may help spread shifter if it does not come off easy.
Easy job.
There maybe be a small rubber plug in an oil passage, make sure you don't blow it out.