The problem with wd40 is that when it dries out it tends to stick the tyre to the rim making it very difficult to break the bead should the tyre need removing at a later date.
I think your problem with getting the tyre on is, as XS says, that the side already on the rim needs to be in the recess in the centre of the rim. Working at home I usually put the wheel on an old tyre which helps to protect the disc, and I kneel on the tyre being fitted which pushes it down into the well and then lever the tyre on in small chunks using two mp tyre levers. How easily it goes on depends to some extent on the tyre and the temperature ( leaving the tyre in the sun for a while can make a big difference). Lube can help as well although can also cause the tyre levers to slide around too much. The main use for the lube is to help the tyre seat on the bead when it is inflated.
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