We have a three minute bath system. We connect it to the bathtub spout, it holds soap that is released when we press a button, and we use a rubber brush while bathing, makes the process very easy. Pan HATES getting wet, so it normally involves me holding on to him like a hug and telling him that its okay - so we both end up smelling like wet dog... lol.
We never get his head wet while we bath him just to reduce the chance of ear infections - we just take a rag and wipe it down. I know others put cotton balls in the ear - but Pan will fight to the bitter end to get the cotton out of his ears.
You're still new to your bully, so it may take awhile for him to get acclimated. Just stay consistent. You may also find it easier to take him to the groomer, at least long enough for him to get use to the whole grooming process.