Tips on how to tie a corset?

If the front has fastenings, it's possible, though less than ideal, to have the back already laced and then put it on and fasten the front yourself. If the front has hook and eye fastenings or a zipper or some other static (non-adjustable) form of fastening, this will be more tricky, and you will probably not be able to have the back laced very tightly, unless some part of the corset or the fastenings is stretchy.. If the corset laces in the front, it's much easier to have the back prelaced and then tie the front yourself. Do note, however, that in order to wear a corset properly and have it fit and work correctly, it's really necessary to lace from the back. It should be laced using two strings in the back, one lacing from the top to the middle and the other lacing from the bottom to the middle, both tying in the center to draw the waist in to create the hourglass shape. This is, however, really only important in the case of corsets with real (not plastic) boning that actually shape your body. Fashion lingerie corsets, like those from Fredericks or Victoria's Secret usually have flimsy plastic boning and won't shape you much, if at all, so it's not as important to lace these from the back. It's nearly impossible to properly lace and tie a corset on yourself unless you are double jointed.
If your BF has a thing for corsets, consider exploring corsetry as a fetish, especially if you have any leanings towards submission and he has any towards domination or control. Corsets can be a part of fetish-y play and bondage if you have any inclinations toward that sort of thing. Waist training with corsets and waist cinchers can be part of this. He might enjoy lacing you up into your corsets as part of your play together. Many Masters/Mistresses/Dom s/Dommes/etc enjoy this as part of the power exchange and simply as a hot fetish. Wearing a true corset can be very confining, very restricting, requires good posture and breath control, limits your movement and activity and, with regular use, can actually shape your body in ways that will last after you take it off, all of which can play nicely into a power exchange or BDSM play or relationship. For me, wearing my corsets is a turn on, for several reasons. i enjoy the sensations, the feeling of being confined that way. When restricted in my corset, my Mistress touching the corset, or sometimes hitting or whipping it, can be extremely pleasurable and sexy. The restriction heightens sensitivity of the skin so that i can feel sensations through my corset sometimes better than if they were on my bare skin. Also, removing the corset causes blood to quickly rush to the area where the corset was which creates interesting sensations that can be controlled by how fast or slow the corset is removed. Corsets can also make me feel submissive and under the power of my Mistress when used properly. i also enjoy the challenge of wearing them and training my body to be able to lace tighter and tighter. Of course my corsets also simply make me feel very sexy and my Mistress thinks they're sexy on me so this is also a major turn on for us both. If you do decide to pursue corsetry seriously, especially as a fetish, both you and your BF need to do research and, ideally, find a mentor or teacher to learn to do it properly and safely so you don't get hurt.