CCIE approach
Interest in the CCIE is rising on TE with many candidates working towards it in 2012 and others considering it. I offer some advice based on personal experience and observation of the habits of many successful candidates over the years..
Your best time to study is 9 to 5, whatever you can get away with. This is when your mind and body is most fresh. I advise you discuss this with your boss because if it is going to be a regular thing it could create issues for you with workmates who dont study, and you need to be sure you have time to meet your obligations at work. Get some buy in so problems about managing your time dont come up in your appaisals. Even one hour every other day at work studying adds up over a year.
Outside of work when it comes to studying, allow for travel time, time with loved ones and yes, some time for yourself. Make a long term plan and discuss with your wife/partner. Be sensitive and keep it flexible. If your job is demanding, hawking up until 2AM regularly doing labs really might not be in your best interests professionally. You need not only sleep to perform at work, but time in the evenings to disconnect, and lab practice when tired isn't always beneficial if you have a busy day ahead where you need to do well in meetings, produce material and handle things. People count on you at work so do look after yourself.
You mustn't be lazy and should push yourself, but if you are fatigued in the evening go for a lighter session and if *really* fatigued, give it up. Also have some off nights. You need not spend these alone. Socialise if you dont have a partner, and if you do have one spend it with them.
When you do lab practice, have an objective in mind and see it through.
Do your best to study during the week, but the weekend is where the CCIE lab is won. So forget games and other pointless distractions at the weekend. Dont forget your kids, your wife and helping around the house. Weekends is when lots of wives need a break and have plans for your time.
Regularity is key for CCIE lab practice but do be realistic about what you have to give. People have beasted themselves to pass the exam, but if your job is anywhere senior you need to perform at work. You are also needed at home. Too many candidates go on a feeding frenzy of late nights for 6 - 12 weeks only to burn out not only on the lab, but also professionally and personally. It takes time to recover from that and it's not unknown for CCIE candidates to end up living alone because of it. Remember, while you put in the long hours you are moving towards an objective which is personally motivating, but for loved ones it feels more like solitude..again. This takes it's toll on people around you. Even if they do seem to be fine doing something else, check in. Women like to spend time with their blokes and going to bed alone can get old for spouses. Less study time is ok, so long as it is regular. A break of several weeks and months will hurt your prepartions, so at least read something if hands on prep isn't an option for a protracted period.
For the off and on candidates, like myself, year 1 is important. I certainly labbed hard and regularly that year, and while hiatus has it's problems, the hard miles I put in then to this day help me when I pick up the studies and start getting regular again. So if you are likely to be a longtermer, have a solid first year. Incidently, longtermers do pass the CCIE lab exam, groupstudy has many examples of over the years.
The written works. Opinion is divided on this but a written exam well studied for has certainly helped me in my lab prep. A Vendor workbook scenario and solution can remain wholly puzzling without those hard reading miles particularly if your opportunities to do hands on have been limited on a regular basis.
Good Luck!