I need to replace the ignition switch on a 1990 LS 400. My daughter lost the key in the first place the problem started when it wouldnt start. Is there a way to remove the switch without the key? Thank you for your time

You can replace the ignition without the key but I would like to tell you a couple of problems you may still have.If there is no keyless entry or number code pad to open the doors,you either cannot lock it or have to replace them.If there is no trunk latch or button inside,you cannot access the trunk.If you have never done an ignition switch,it will be very tedious,time consuming,and test your patience.You should at least get a parts breakdown or instruction from a repair manual if you have never done it either.A dealer may or may not provide one,a library sometimes has chilton or haynes to check out,or buy one at a national parts store if you plan on keeping the car a long time.The first one I did,I had all the necessary stuff and it did to me what I told you to be prepared for.The second time I had an ignition problem,I ended up buying a used steering wheel from a salvage yard.It cost a little more but I had a new key and was double digit hours less time and only about 4 bolts and disconnect some wiring.After that,I removed all valuables/car papers,left it unlocked,and simply removed the starter fuse every night.i did that for quite a while when the key was stuck in the ignition and would not come out.When I did get it out,you could start it simply by turning it on without even a key needed.I figured if a thief is going to be stupid enough to steal my 8 year old Buick not worth much,he is too stupid to even know about a fuse.Anyhow,each car make is obviously different.I could attempt to give you step by step instructions to do it but there are so many little tricks or whatever you want to call it that there is not exactly a universal way to do it for every car.If you get the diagrams,you can at least see what to expect and if there is some strange method,they will tell you.Also,I would like you to look at my profile and read my tips about car keys.It is good info and should be free.I am not here strictly to make money but to inform and educate because I have done many things,so many that I can only list about half in my profile because of their size limits and people get taken all the time.I was taken by a shop a couple years ago because I let down my guard and did not know the guy that always worked on my car was gone and did not follow my normal Q&A procedure.Also,I hope you read about the keys and please spread the word to friends,family,etc.
In your case you would not even have to have been here had you known. Good luck! Greg