Its always hard to tell others how easy or hard something is, I think it comes down to you and how comfortable you are with taking things apart and putting them back together. The job itself isn't hard and yes I think its easier taking the rear wheel off, but it is time consuming. Other factors are having a lift or not...for me I can't stand doing this kind of work on the ground, but at min you need a decent jack and some patience.
You can always take just the shock down to the shop and get them to change out the spring, personally I feel you get more out of things when you do them yourself, but everyone isn't comfortable doing this kind of stuff, so in the end I think its an easy job.
You can always take just the shock down to the shop and get them to change out the spring, personally I feel you get more out of things when you do them yourself, but everyone isn't comfortable doing this kind of stuff, so in the end I think its an easy job.