Tankless water heater install - possible DIY job?

I am thinking about placing a new tankless water heater in my house to save some energy and take advantage of the tax credits. I can find good heaters for around a $1000, but am wondering if this could possibly be a DIY install. I have some plumbing experience and follow instructions well, but am wondering if... show more I am thinking about placing a new tankless water heater in my house to save some energy and take advantage of the tax credits. I can find good heaters for around a $1000, but am wondering if this could possibly be a DIY install. I have some plumbing experience and follow instructions well, but am wondering if anyone has had any success with this type of project.

If there are any professional plumbers here I would also love your feedback. Considering I have natural gas I am assuming there is no way I could do it myself, but was crossing my fingers I could do it.

Also, if anyone has had one installed professionally, approx how much did it cost you and how long did it take? Thanks a million!
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