Since it's a LTM lens, It's pretty simple.
The decorator ring at the front unscrews & the front element or group will simply drop out.
It should be obvious which direction the first element faces but be careful to note the following elements.
It's possible to install them backwards.
If the group falls out as an assembly it's easier but if you take it apart note how the elements face.
Same thing for the rear. There usually a spanner ring to remove & everything should fall out.