I found this book very good on the subject (it's free to borrow with an Amazon Prime sub):
http://www.amazon.com/Why-Bother-Bonds-All-Weather-Independence/dp/0985800402/ref=sr_1_1?ie=UTF8&qid=1427845472&sr=8-1&keywords=why+bother+with+bondsThe concept of duration is fairly easy to understand (and simulate via spreadsheet) and Morningstar lists duration for funds (though I am not sure how accurate it is). The concept that really sold me was that rising interest rates would always lead to larger absolute returns over time if holding longer than the listed duration. (The question of real return can not really be answered since inflation is a significant unknown.) As always, if you are looking for a short term store of value, bonds do not fit. Cash only fits that need safely.
The affect of interest on principal is also a function of risk. CA muni debt is not AAA. (It is typically a mix of BBB/A/AA). So it is important to understand interest rates do not affect all categories of debt equally.
Holding bonds to maturity does not reduce interest rate risk. You still suffer opportunity cost and theoretically, selling your bond for one of equal maturity date at the higher interest rate ends up equivalent mathematically. Holding to maturity also doesn't necessarily make sense if the maturity date has no meaning to your strategy. If you are holding bonds to hold bonds, an intermediate bond fund will have a mix of intermediate term bonds and sell them as they become short term bonds (definition fluid, of course) to buy new intermediate bonds. This keeps maturity consistent. Holding to maturity results in holding a mix of short term, intermediate term and long term bonds, assuming you are laddering them. If you are simply worried about an artificial short term loss of principal, you can take this approach, but it shouldn't improve or reduce your overall returns by doing so.
Trying to time rate increases is no different than doing it with stocks. If you decide to buy back in after one or two, there might be five more coming. Bonds are guaranteed to drift back to par (unlike stock) so waiting is a serious enemy to total returns. This number is controlled by a select few human beings and they set it for reasons that have little to do with returns of current bondholders. SEC yield and bond duration is listed on every fund in Morningstar, you can find any calculator and see what the impact is for various scenarios.
We've been expecting this first increase for so long I am not even sure it isn't already baked into current valuations. The market will usually start valuing the risk of a rate increase before it happens because obviously people are expecting it.