Wheel Fitment

I’m trying to convert my 7x9 5x100 Wheels to a 8x9.5 + 10 or +11 5x114.
I’m told all I may need is a hub/spacer. These will be sitting on coilovers. My question is is this true? I don’t want to order If I’m going to need to cut into my fenders etc. Some say I need $1500 worth of work out into it to make these wheels fit on here. Any set up suggestions to make this fitment work? Or if anyone thinks I need much higher offset than +10/11 ? And if I do only need a spacer how would I know what size spacer I will need?

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