travelling corporeal...i love to push the boundaries so i just want to say this once... the only things that can pass through a portal are the dead, astral bodies, and the superhuman creatures such as dietes and gods.
The reason a living body cannot pass through is because one, there is nothing there physical, only made of energy so if you did go through you would probably suffocate, explode, or dematerialize into spiritual energy for the scenery... either way your not coming back.
If you want to try going through a portal in a corporeal form i suggest using a summoning ritual and passing through the same doorway as the beast you summoned. Normally the best beast to summon (so that they keep the door open for you to return possibly) is a deal-making demon (you will need to offer something valuable in return) or you can go with a demon referred to in ancient times like Agares (he appears willingly), Gaap (prince of hell, and a transporter demon), Kasdeya (5th satan), or Leonard (master of black magick and sorcery)... these are just a few of you best bets...
I have summoned Agares with a black mirror but if you want to go with a black mirror like myself go with a protection circle or a circle from solomon the great king. Also put runic barriers around your area of work so the demon you call (once they answer) will listen to you without leaving.
I havent tried corporeal travel but he can help guide your spirit through hell (i only made to the 3rd level down, or whatever before i wanted to turn back...its pretty bad down there)... but dont take my word for it if you want to try corporeal travel talk to a demon...they are only ones crazy enough to go along with it...
Also if your intrested in my offering to Agares, i gave him continued offerings of my chakra that i gathered every week per level of suffering i was allowed into to see through him... So for 3 weeks after that i was a half-dead drone because i had no chakra left to do anything. THINK OVER YOUR OFFERING
also another demon you might want to conjure named lilith...she waits in the 6th level of hell taking particular fun in the torture of mortal souls... i have no idea if its the same lilith you speak of but ya, she is said to be the demon of waste because rumor is she is very sloppy with how she cuts the body.