How to change an intermediate steering shaft on a Kia Sportage 01

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I bought this truck privately off kijiji. Now after a week of driving the steering is stiff in two spots. I've been told I need to change my intermediate steering shaft, repack my wheel bearings, and replace the idler arm. Are any of these small jobs? How much should this cost? The quote I've been given seems high, 1500 before tax. Im wondering if my dad and I could do the work ourselves. Where can I find a step by step instructions on how to do this? How much do these parts cost? Any tips on how to save money at the mechanics! Thanks! Any info helps... I'm a single mom and don't have 1500$ laying around!