get a basic price per metre of guttering for example
£3.50 for gutter fascia soffits (for 1 level) £1.50 (for ground level)
£5.50 for gutter clearance, gutters fascia and soffits. take an approximation measurement and work it out..
Make a note of any hard to reach or awkward areas and increase the price somewhat to care for that.
For conservatories once you get a few under your belt you can then see how long it takes you for the size and you can work out your own method of pricing.
Most people expect you to do a conny roof or gutters for like £20! when a more realistic price is like £80 taking into account travelling, tools, cleaning solutions etc.
As previous have said, get a good window cleaning round done, and then over price for other services.. you then dont care if you get the extra or not cos its difficult to get them fitted in.
Dont mug yourself off, you can prob earn more money by working in a warehouse!
Dont forget you dont get sick pay, holiday pay, pension etc when your SE.. you also need to take into account your business overheads such as insurance, tools and up keeps, vehicle servicing and repairs etc.