Camshaft Removal

Ok guys ran into a couple problems with the camshaft. First things first I went off and removed the timing chain without putting engine at TDC so pretty big problem there bc the cam is already out. Onto next problem while trying to install new cam I can get it all the way in until the last journal then its like i hit a wall I can't get it to go any further. Whats the hold up? Any help you guys can provide will be greatly appreciated right now.