hi there.
That I can tell you, to solve the problems you have is not work that you can do if you do not have the necessary experience or the tools. It is true that you have to disassemble the cylinder head and mount it with tightening procedures and with a specified torque according to manual to the bolts that hold it, but in addition to that, the butt is necessary to carry out more maintenance work;
Among which I can tell you verification of valve and guide adjustment, rectified valve seats, valve rectified, verification of the adjustment zone
and thus several things that if you do not do them this time, it will be half jobs.
From here we can give you a lot of information but think about it before doing so.
Ok and tell us.
LUCKEEEEEEEE