Bla Bheinn is a magnificent mountain with stunning views. Although it looks very steep, the path up the hill is 99% walk and 1% easy scramble.
Isle of Skye, also known as "Misty Isle", has only few really good days for climbing the higher mountains. The best time is usually from mid April to the end of May, but you can be lucky and experience a great day throughout the whole year. From my experience, it is better to start after noon, since evenings are usually more calm on Skye. Check the forecast before you go!