Warm water should be used to soak your arms. Shaving dry skin causes more scrapes, lumps, and scratches. Make sure your arms are well-hydrated before shaving by soaking them in warm water for three to five minutes in a bath or shower. The warmer the water, the less likely it is to cause pain when you shave. Arms hair can also cause problems such as infections if you don't shave or trim them regularly. Stubble can lead to chafing which can cause irritation and blisters. If you don't clean up after yourself, then you're going to get burned from all that soap or gel you use during the week of camping out here at the cabin with no showers. Finally, not everyone has the same skin type. Dry skin is very fragile and can become irritated when shaved. This means you should always start with cold water and test your new technique on a small area of skin first. If you feel like you're causing too much pain then switch back to hot water until you find a method that works for you. After you shave, apply a soothing cream or lotion to your skin to prevent any soreness or irritation. Avoid using alcohol based products since they will dry out your skin even more. Use a product with little to no fragrance since these chemicals can irritate skin even more.