It depends on the technical complexity of your ideas, if it's just going to be a mod of an off-the-shelf CMS or something similar then you'll probably be fine.
The greater the technical complexity the more risky it is because there are far fewer outsourcing providers with the skills to achieve what you want.
(There are some exceptions to this: for example there are plenty of iphone app development agencies that are capable of taking on large complex projects)
The greater the technical complexity the more risky it is because there are far fewer outsourcing providers with the skills to achieve what you want.
(There are some exceptions to this: for example there are plenty of iphone app development agencies that are capable of taking on large complex projects)