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a 17" min wheel is required. width can be between 8-9 inches with an offset of 42 and lower. The last requirement is the spoke design. I dont know which wheels your running but to give you referrence. I test fitted a 18x8.5 +42 Enkie RPO3 with no problems. a 2nd gen GS400 wheel will aslo fit with a 15mm spacer (17x8 +50 plus 15mm spacer)
BBK is bolt on, and requires a little mechanical common sense. Shield may either be trimmed or removed. some cleaning/sanding/grinding of stock components may be required to remove burrs/rusted parts etc (i dont know your cars condition)
if you can not handle this i would recommend a mechanic install this kit for you.