Willd423, I'm sorry to hear that. Perhaps a bit of rekindling it due?
To answer the question A bottle of lube, a towel or kleenex to wipe up any mess (some people do an at home enema) and about two hours and a ton of patience.
Don't mean to be so vulgar, but I don't see any other way around this: your boyfriend is probably a bit smaller than your biggest piece of poo, so as long as you ease into it WITH TONS OF LUBE you should adjust rather easily. The only problem I had with my husband was that I felt like I had to go and I was afraid to accidentally do it on him!
Also I would suggest using a condom as it keeps everything nice and tidy, and helps prevent you getting a hemmohroid. Go slow and don't feel obligated to follow all the way through if you really don't like it.
Good luck!