Hi JL,
Firstly, what breed is the doggy in your picture?! i did a double take as I have a Japanese Akita and the one in the pic looks similar
As already mentioned, there are many mortgage calculators on lots of websites - have a search for 'mortgage calculator' on yahoo or google.
the 'ease' on getting a mortgage depends on a number of things. The best chance of securing funding relatively quickly is to show you are able to put down as large a deposit as possible, show relatively small amounts of personal debt (credit store cards loans etc) and in long term employment. Reductions in those will usually take longer to get the mortgage approval process longer as they do more checks etc. Ideally, if you had 25 or 30 % deposit to put down, they'd probably approve you within a few days!
i'd second the suggestion to go see specialist mortgage brokers as they have access to sell mortgages the bigger places just wont do.
As far as things to watch out go -
1. DONT overspend or overstretch yourself - it's difficult to do when you see a fantastic property which is 15 grand over your budget - try to stick to your means
2. Carefully assess your lifestyle and current standing, dont overstretch yourself to putting more money towards a mortgage repayment amount each month if it means you;ll be stretched in other areas.
3. factor in all the secondary costs, council tax, utility payments, maintenence costs, repair costs, insurance, life assurance, solicitors fees, land surveys etc etc.
4. DONT go for the crazy 5 and 6 and 7 times Salary multiplier mortgages - unless you are highly paid as those mortgages suit those with much higher than average salaries.
There's plenty more info on this and other sites, so time to do yer research!!
Good luck!
DtM! West London & Slough UK!