Suspension replacement

That is way too involved for even a competent do-it-yourselfer. If you want to pursue this, get a copy of the manufacturer's service manual, read through the many pages of instructions, then decide if you still want to attempt this. We do not have service information for this model, so I cannot tell which type of suspension system it has. You will need to tell me that, then I may be able to offer some advice to help you avoid creating more problems.